Theory of Weak Localization in Ferromagnetic (Ga,Mn)As (2008)
Garate, Ion, Sinova, Jairo, Jungwirth, T., MacDonald, A. H.
We study quantum interference corrections to the conductivity in (Ga,Mn)As ferromagnetic semiconductors using a model with disordered valence band holes coupled to localized Mn moments through a p-d...
Spin-injection Hall effect in a planar photovoltaic cell (2008)
Wunderlich, J., Irvine, A. C., Sinova, Jairo, Park, B. G., Xu, X. L., Kaestner, B., ...
Successful incorporation of the spin degree of freedom in semiconductor technology requires the development of a new paradigm allowing for a scalable, non-destructive electrical detection of the...
Semiclassical framework for the calculation of transport anisotropies (2008)
Vyborny, Karel, Kovalev, Alexey A., Sinova, Jairo, Jungwirth, T.
We present a procedure for finding the exact solution to the linear-response Boltzmann equation for two-dimensional anisotropic systems and demonstrate it on examples of non-crystalline anisotropic...
Borunda, M. F., Liu, Xin, Kovalev, Alexey A., Liu, Xiong-Jun, Jungwirth, T., Sinova, Jairo
We study the quantum interference effects induced by the Aharonov-Casher phase in asymmetrically confined two-dimensional electron and heavy-hole ring structures systems taking into account the...
Coherent control of magnetization precession in ferromagnetic semiconductor (Ga,Mn)As (2008)
Rozkotova, E., Nemec, P., Tesarova, N., Maly, P., Novak, V., Olejnik, K., ...
We report single-color, time resolved magneto-optical measurements in ferromagnetic semiconductor (Ga,Mn)As. We demonstrate coherent optical control of the magnetization precession by applying two...
Low voltage control of ferromagnetism in a semiconductor p-n junction (2008)
Owen, M. H. S., Wunderlich, J., Novak, V., Olejnik, K., Vyborny, K., ...
The concept of low-voltage depletion and accumulation of electron charge in semiconductors, utilized in field-effect transistors (FETs), is one of the cornerstones of current information processing...
Curie point singularity in the temperature derivative of resistivity in (Ga,Mn)As (2008)
Novak, V., Olejnik, K., Wunderlich, J., Cukr, M., Vyborny, K., Rushforth, A. W., ...
We observe a singularity in the temperature derivative $d\rho/dT$ of resistivity at the Curie point of high-quality (Ga,Mn)As ferromagnetic semiconductors with $T_c$'s ranging from approximately 80...
Huge tunnelling anisotropic magnetoresistance in (Ga,Mn)As nanoconstrictions (2008)
Giddings, A. D., Makarovsky, O. N., Khalid, M. N., Yasin, S., Edmonds, K. W., Campion, R. P., ...
We report large anisotropic magnetoresistance (AMR) behaviours in single lateral (Ga,Mn)As nanoconstriction of up to 1300%, along with large multistable telegraphic switching. The nanoconstriction...
Laser-induced Precession of Magnetization in GaMnAs (2008)
Rozkotova, E., Nemec, P., Sprinzl, D., Horodyska, P., Trojanek, F., Maly, P., ...
We report on the photo-induced precession of the ferromagnetically coupled Mn spins in (Ga,Mn)As, which is observed even with no external magnetic field applied. We concentrate on various...
De Ranieri, E., Rushforth, A. W., Vyborny, K., Rana, U., Ahmed, E., Campion, R. P., ...
It has been demonstrated that magnetocrystalline anisotropies in (Ga,Mn)As are sensitive to lattice strains as small as 10^-4 and that strain can be controlled by lattice parameter engineering during...
Light-induced magnetization precession in GaMnAs (2008)
Rozkotova, E., Nemec, P., Horodyska, P., Sprinzl, D., Trojanek, F., Maly, P., ...
We report dynamics of the transient polar Kerr rotation (KR) and of the transient reflectivity induced by femtosecond laser pulses in ferromagnetic (Ga,Mn)As with no external magnetic field applied....
Nonvolatile ferroelectric control of ferromagnetism in (Ga,Mn)As (2008)
Stolichnov, I., Riester, S. W. E., Trodahl, H. J., Setter, N., Rushforth, A. W., Edmonds, K. W., ...
There is currently much interest in materials and structures that provide coupled ferroelectric and ferromagnetic responses, with a long-term goal of developing new memories and spintronic logic...
Olejnik, K., Owen, M. H. S., Novak, V., Masek, J., Irvine, A. C., Wunderlich, J., ...
(Ga,Mn)As and related diluted magnetic semiconductors play a major role in spintronics research because of their potential to combine ferromagnetism and semiconducting properties in one physical...
Domain walls in (Ga,Mn)As diluted magnetic semiconductor (2008)
Sugawara, Akira, Kasai, H., Tonomura, A., Brown, P. D., Campion, R. P., Edmonds, K. W., ...
We report experimental and theoretical studies of magnetic domain walls in an in-plane magnetized (Ga,Mn)As dilute moment ferromagnetic semiconductor. Our high-resolution electron holography...
(Ga,Mn)As based superlattices and the search for antiferromagnetic interlayer coupling (2008)
Giddings, A. D., Jungwirth, T., Gallagher, B. L.
Antiferromagnetic interlayer coupling in dilute magnetic semiconductor superlattices could result in the realisation of large magnetoresistance effects analogous to the giant magnetoresistance seen...
Tunneling anisotropic magnetoresistance in multilayer-(Co/Pt)/AlOx/Pt structures (2008)
Park, B. G., Wunderlich, J., Williams, D. A., Joo, S. J., Jung, K. Y., Shin, K. H., ...
We report observations of tunneling anisotropic magnetoresitance (TAMR) in vertical tunnel devices with a ferromagnetic multilayer-(Co/Pt) electrode and a non-magnetic Pt counter-electrode separated...
Rushforth, A. W., De Ranieri, E., Zemen, J., Wunderlich, J., Edmonds, K. W., King, C. S., ...
We demonstrate dynamic voltage control of the magnetic anisotropy of a (Ga,Mn)As device bonded to a piezoelectric transducer. The application of a uniaxial strain leads to a large reorientation of...
Non-volatile ferroelectric control of ferromagnetism in (Ga, Mn)As (2008)
Stolichnov, I., Riester, S. W. E., Trodahl, H. J., Setter, N., Rushforth, A. W., Edmonds, K. W., ...
The Origin and Control of the Sources of AMR in (Ga,Mn)As Devices (2007)
Rushforth, A. W., Výborný, K., King, C. S., Edmonds, K. W., Campion, R. P., Foxon, C. T., ...
We present details of our experimental and theoretical study of the components of the anisotropic magnetoresistance (AMR) in (Ga,Mn)As. We develop experimental methods to yield directly the...
Wunderlich, J., Irvine, A. C., Zemen, J., Holy, V., Rushforth, A. W., De Ranieri, E., ...
The large saturation magnetization in conventional dense moment ferromagnets offers flexible means of manipulating the ordered state through demagnetizing shape anisotropy fields but these dipolar...
Jungwirth, T., Sinova, Jairo, MacDonald, A. H., Gallagher, B. L., Novak, V., Edmonds, K. W., ...
We discuss the character of states near the Fermi level in Mn doped GaAs, as revealed by a survey of dc transport and optical studies over a wide range of Mn concentrations. A thermally activated...
Anomalous Hall effect in a two-dimensional electron gas (2007)
Nunner, Tamara S., Sinitsyn, N. A., Borunda, Mario F., Kovalev, A. A., Abanov, Ar., Timm, Carsten, ...
The anomalous Hall effect in a magnetic two-dimensional electron gas with Rashba spin-orbit coupling is studied within the Kubo-Streda formalism in the presence of pointlike potential impurities. We...
Anisotropic Magnetoresistance components in (Ga,Mn)As (2007)
Rushforth, A. W., Výborný, K., King, C. S., Edmonds, K. W., Campion, R. P., Foxon, C. T., ...
Our experimental and theoretical study of the non-crystalline and crystalline components of the anisotropic magnetoresistance (AMR) in (Ga,Mn)As is aimed at exploring the basic physical aspects of...
Borunda, Mario F., Nunner, Tamara S., Luck, Thomas, Sinitsyn, N. A., Timm, Carsten, Wunderlich, J., ...
We study the anomalous Hall conductivity in spin-polarized, asymmetrically confined two-dimensional electron and hole systems, focusing on skew-scattering contributions to the transport. We find that...
Aharonov-Casher effect in a two dimensional hole gas with spin-orbit interaction (2007)
Kovalev, Alexey A., Borunda, Mario F., Jungwirth, T., Molenkamp, L. W., Sinova, Jairo
We study the quantum interference effects induced by the Aharonov-Casher phase in a ring structure in a two-dimensional heavy hole (HH) system with spin-orbit interaction realizable in narrow...
Interlayer exchange coupling in (Ga,Mn)As based multilayers (2006)
Giddings, A. D., Jungwirth, T., Gallagher, B. L.
Exhibiting antiferromagnetic interlayer coupling in dilute magnetic semiconductor multilayers is essential for the realisation of magnetoresistances analogous to giant magnetoresistance in metallic...
Mn-doped Ga(As,P) and (Al,Ga)As ferromagnetic semiconductors (2006)
Masek, J., Kudrnovsky, J., Maca, F., Sinova, Jairo, MacDonald, A. H., Campion, R. P., ...
A remarkable progress towards functional ferromagnetic semiconductor materials for spintronics has been achieved in p-type (Ga,Mn)As. Robust hole-mediated ferromagnetism has, however, been observed...
Holy, V., Matej, Z., Pacherova, O., Novak, V., Cukr, M., Olejnik, K., ...
A combination of high-resolution x-ray diffraction and a new technique of x-ray standing wave uorescence at grazing incidence is employed to study the structure of (Ga,Mn)As diluted magnetic...
Dilute moment n-type ferromagnetic semiconductor Li(Zn,Mn)As (2006)
Masek, J., Kudrnovsky, J., Maca, F., Gallagher, B. L., Campion, R. P., Gregory, D. H., ...
We propose to replace Ga in (Ga,Mn)As with Li and Zn as a route to high Curie temperature, carrier mediated ferromagnetism in a dilute moment n-type semiconductor. Superior material characteristics,...
Sinitsyn, N. A., MacDonald, A. H., Jungwirth, T., Dugaev, V. K., Sinova, Jairo
The anomalous Hall effect (AHE) is a consequence of spin-orbit coupling in a ferromagnetic metal and is related primarily to density-matrix response to an electric field that is off-diagonal in band...
Theory of ferromagnetic (III,Mn)V semiconductors (2006)
Jungwirth, T., Sinova, Jairo, Masek, J., Kucera, J., MacDonald, A. H.
The body of research on (III,Mn)V diluted magnetic semiconductors initiated during the 1990's has concentrated on three major fronts: i) the microscopic origins and fundamental physics of the...
Coulomb blockade anisotropic magnetoresistance: Singleelectronics meets spintronics (2006)
Wunderlich, J., Jungwirth, T., Kaestner, B., Irvine, A. C., Wang, K., Stone, N., ...
Single-electronics and spintronics are among the most intensively investigated potential complements or alternatives to CMOS electronics. Single-electronics, which is based on the discrete charge of...
Shick, A. B., Maca, F., Masek, J., Jungwirth, T.
Tunneling anisotropic magnetoresistance (TAMR) effect, discovered recently in (Ga,Mn)As ferromagnetic semiconductors, arises from spin-orbit coupling and reflects the dependence of the tunneling...
Edge spin accumulation in semiconductor two-dimensional hole gases (2005)
Nomura, K., Wunderlich, J., Sinova, Jairo, Kaestner, B., MacDonald, A. H., Jungwirth, T.
The controlled generation of localized spin densities is a key enabler of semiconductor spintronics In this work, we study spin Hall effect induced edge spin accumulation in a two-dimensional hole...
Low-temperature magnetization of (Ga,Mn)As semiconductors (2005)
Jungwirth, T., Masek, J., Wang, K. Y., Edmonds, K. W., Sawicki, M., Polini, M., ...
We report on a comprehensive study of the ferromagnetic moment per Mn atom in (Ga,Mn)As ferromagnetic semiconductors. Theoretical discussion is based on microscopic calculations and on an effective...
Co-planar spin-polarized light emitting diode (2005)
Kaestner, B., Wunderlich, J., Sinova, Jairo, Jungwirth, T.
Studies of spin manipulation in semiconductors has benefited from the possibility to grow these materials in high quality on top of optically active III-V systems. The induced electroluminescence in...
Prospects of high temperature ferromagnetism in (Ga,Mn)As semiconductors (2005)
Jungwirth, T., Wang, K. Y., Masek, J., Edmonds, K. W., Konig, Jurgen, Sinova, Jairo, ...
We report on a comprehensive combined experimental and theoretical study of Curie temperature trends in (Ga,Mn)As ferromagnetic semiconductors. Broad agreement between theoretical expectations and...
Band structure of semimagnetic Hg1-yMnyTe quantum wells (2004)
Novik, E. G., Pfeuffer-Jeschke, A., Jungwirth, T., Latussek, V., Becker, C. R., Landwehr, G., ...
The band structure of semimagnetic Hg_1-yMn_yTe/Hg_1-xCd_xTe type-III quantum wells has been calculated using eight-band kp model in an envelope function approach. Details of the band structure...
Manifestation of the spin-Hall effect through transport measurements in the mesoscopic regime (2004)
Hankiewicz, E. M., Molenkamp, L. W., Jungwirth, T., Sinova, Jairo
We study theoretically the manifestation of the spin-Hall effect in a two-dimensional electronic system with Rashba spin-orbit coupling via dc-transport measurements in realistic mesoscopic H-shape...
Large tunneling anisotropic magnetoresistance in (Ga,Mn)As nanoconstrictions (2004)
Giddings, A. D., Khalid, M. N., Wunderlich, J., Yasin, S., Campion, R. P., Edmonds, K. W., ...
We report a large tunneling anisotropic magnetoresistance (TAMR) in a thin (Ga,Mn)As epilayer with lateral nanoconstrictions. The observation establishes the generic nature of this effect, which...
1500-fold Tunneling Anisotropic Magnetoresistance in a (Ga,Mn)As stack (2004)
Rüster, C., Gould, C., Jungwirth, T., Sinova, J., Schott, G. M., Giraud, R., ...
We report the discovery of a super-giant tunneling anisotropic magnetoresistance in an epitaxially grown (Ga,Mn)As/GaAs/(Ga,Mn)As structure. The effect arises from a strong dependence of the...
Gould, C., Rüster, C., Jungwirth, T., Girgis, E., Schott, G. M., Giraud, R., ...
We introduce a new class of spintronics devices in which a spin-valve like effect results from strong spin-orbit coupling in a single ferromagnetic layer rather than from injection and detection of a...
Non-vanishing spin Hall currents in disordered spin-orbit coupling systems (2004)
Nomura, K., Sinova, Jairo, Jungwirth, T., Niu, Q., MacDonald, A. H.
Spin currents that flow perpendicular to the electric field direction are generic in metals and doped semiconductors with spin-orbit coupling. It has recently been argued that the spin Hall...
Hankiewicz, E. M., Jungwirth, T., Dietl, T., Timm, C., Sinova, Jairo
We report on a study of the ac conductivity and magneto-optical properties of metallic ferromagnetic (III,Mn)V semiconductors in the infrared to visible spectrum. Our analysis is based on the...
Sinova, Jairo, Jungwirth, T., Cerne, J.
Rapid developments in material research of metallic ferromagnetic (III,Mn)V semiconductors over the past few years have brought a much better understanding of these complex materials. We review here...
Semiclassical theory of spin transport in spin-orbit coupled systems (2003)
Culcer, Dimitrie, Sinova, Jairo, Sinitsyn, N. A., Jungwirth, T., MacDonald, A. H., Niu, Q.
Motivated by recent interest in novel spintronics effects, we develop a semiclassical theory of spin transport that is valid for spin-orbit coupled bands. Aside from the obvious convective term in...
Magnetization relaxation in (Ga,Mn)As ferromagnetic semiconductors (2003)
Sinova, Jairo, Jungwirth, T., Liu, X., Sasaki, Y., Furdyna, J. K., Atkinson, W. A., ...
We describe a theory of Mn local-moment magnetization relaxation due to p-d kinetic-exchange coupling with the itinerant-spin subsystem in the ferromagnetic semiconductor (Ga,Mn)As alloy. The...
Numerical Investigation on Asymmetric Bilayer System at Integer Filling Factor (2003)
Nomura, K., Yoshioka, D., Jungwirth, T., MacDonald, A. H.
Deformation of the easy-axis ferromagnetic state in asymmetric bilayer systems are investigated numerically. Using the exact diagonalization the easy-axis to easy-plane ferromagnetic transition at...
Universal Intrinsic Spin-Hall Effect (2003)
Sinova, Jairo, Culcer, Dimitrie, Niu, Q., Sinitsyn, N. A., Jungwirth, T., MacDonald, A. H.
We describe a new effect in semiconductor spintronics that leads to dissipationless spin-currents in paramagnetic spin-orbit coupled systems. We argue that in a high mobility two-dimensional electron...
First Principles Calculation of Anomalous Hall Conductivity in Ferromagnetic bcc Fe (2003)
Yao, Yugui, Kleinman, L., MacDonald, A. H., Sinova, Jairo, Jungwirth, T., Wang, Ding-sheng, ...
We perform a first principles calculation of the anomalous Hall effect in ferromagnetic bcc Fe. Our theory identifies an intrinsic contribution to the anomalous Hall conductivity and relates it to...
Jungwirth, T., Masek, J., Sinova, Jairo, MacDonald, A. H.
We present a theoretical study of (Ga,Mn)(As,C) diluted magnetic semiconductors with high C acceptor density that combines insights from phenomenological model and microscopic approaches. A...
Orbital Effects of In-Plane Magnetic Fields Probed by Mesoscopic Conductance Fluctuations (2003)
Zumbuhl, D. M., Miller, J. B., Marcus, C. M., Fal'ko, V. I., Jungwirth, T., Harris Jr, J. S.
We use the high sensitivity to magnetic flux of mesoscopic conductance fluctuations in large quantum dots to investigate changes in the two-dimensional electron dispersion caused by an in-plane...
Rezayi, E. H., Jungwirth, T., MacDonald, A. H., Haldane, F. D. M.
Opposite spin Landau levels in a quantum well can be brought into coincidence by tilting the magnetic field away from normal orientation. We demonstrate that the magnetotransport anomaly at integer...
DC-transport properties of ferromagnetic (Ga,Mn)As semiconductors (2003)
Jungwirth, T., Sinova, Jairo, Wang, K. Y., Edmonds, K. W., Campion, R. P., Gallagher, B. L., ...
We study the dc transport properties of (Ga,Mn)As diluted magnetic semiconductors with Mn concentration varying from 1.5% to 8%. Both diagonal and Hall components of the conductivity tensor are...
Infrared magneto-optical properties of (III,Mn)V ferromagetic semiconductors (2003)
Sinova, Jairo, Jungwirth, T., Kucera, J., MacDonald, A. H.
We present a theoretical study of the infrared magneto-optical properties of ferromagnetic (III,Mn)V semiconductors. Our analysis combines the kinetic exchange model for (III,Mn)V ferromagnetism with...
Theoretical models of ferromagnetic III-V semiconductors (2002)
Jungwirth, T., Sinova, Jairo, Kučera, J., MacDonald, A. H.
Recent materials research has advanced the maximum ferromagnetic transition temperature in semiconductors containing magnetic elements toward room temperature. Reaching this goal would make...
Non-Drude Optical Conductivity of (III,Mn)V Ferromagnetic Semiconductors (2002)
Yang, S. -R. Eric, Sinova, Jairo, Jungwirth, T., Shim, Y. P., MacDonald, A. H.
We present a numerical model study of the zero-temperature infrared optical properties of (III,Mn)V diluted magnetic semiconductors. Our calculations demonstrate the importance of treating disorder...
Boltzmann theory of engineered anisotropic magnetoresistance in (Ga,Mn)As (2002)
Jungwirth, T., Abolfath, M., Sinova, Jairo, Kucera, J., MacDonald, A. H.
We report on a theoretical study of dc transport coefficients in (Ga,Mn)As diluted magnetic semiconductor ferromagnets that accounts for quasiparticle scattering from ionized Mn$^{2+}$ acceptors with...
Infrared conductivity of metallic (III,Mn)V ferromagnets (2002)
Sinova, Jairo, Jungwirth, T., Yang, S. - R. Eric, Kučera, J., MacDonald, A. H.
We present a theory of the infrared conductivity and absorption coefficients of metallic (III,Mn)V ferromagnetic semiconductors. We find that the conductivity is dominated by inter-valence-band...
Ferromagnetism in Diluted Magnetic Semiconductor Heterojunction Systems (2002)
Lee, Byounghak, Jungwirth, T., MacDonald, A. H.
Diluted magnetic semiconductors (DMSs), in which magnetic elements are substituted for a small fraction of host elements in a semiconductor lattice, can become ferromagnetic when doped. In this...
Curie Temperature Trends in (III,Mn)V Ferromagnetic Semiconductors (2002)
Jungwirth, T., König, Jürgen, Sinova, Jairo, Kučera, J., MacDonald, A. H.
We present a theoretical survey of ferromagnetic transition temperatures in cubic (III,Mn)V semiconductors based on a model with $S=5/2$ local moments exchange-coupled to itinerant holes in the host...