Magnetic properties of substitutional Mn in (110) GaAs surface and subsurface layers (2009)
Strandberg, T. O., Canali, C. M., MacDonald, A. H.
Motivated by recent STM experiments, we present a theoretical study of the electronic and magnetic properties of the Mn-induced acceptor level obtained by substituting a single Ga atom in the (110)...
Theory of tunneling spectroscopy in a $Mn_{12}$ single-electron transistor by DFT methods (2008)
Michalak, L., Canali, C. M., Pederson, M. R., Benza, V. G., Paulsson, M.
We consider tunneling transport through a $Mn_{12}$ molecular magnet using spin density functional theory. When one delocalized electron is added to or subtracted from the neutral molecule the...
Chern-number spin Hamiltonians for magnetic nano-clusters by DFT methods (2008)
Strandberg, T. O., Canali, C. M., MacDonald, A. H.
Combining field-theoretical methods and ab-initio calculations, we construct an effective Hamiltonian with a single giant-spin degree of freedom, capable of the describing the low-energy spin...
Tunneling anisotropic magnetoresistance in Co/AlOx/Au tunnel junctions (2008)
Liu, R. S., Michalak, L., Canali, C. M., Samuelson, L., Pettersson, H.
We observe spin-valve-like effects in nanoscaled thermally evaporated Co/AlOx/Au tunnel junctions. The tunneling magnetoresistance is anisotropic and depends on the relative orientation of the...
Tunneling Anisotropic Magnetoresistance in Co/AlOx/Au Tunnel Junctions (2008)
Liu, R. S., Michalak, L., Canali, C. M., Samuelson, L., Pettersson, H.
We observe spin-valve-like effects in nano-scaled thermally evaporated Co/AlOx/Au tunnel junctions. The tunneling magnetoresistance is anisotropic and depends on the relative orientation of the...
Large Magnetoresistance in Co/Ni/Co Ferromagnetic Single Electron Transistors (2007)
Liu, R. S., Pettersson, H., Michalak, L., Canali, C. M., Suyatin, D., Samuelson, L.
We report on magnetotransport investigations of nano-scaled ferromagnetic Co/Ni/Co single electron transistors. As a result of reduced size, the devices exhibit single electron transistor...
Liu, R. S., Pettersson, H., Michalak, L., Canali, C. M., Samuelson, L.
We have investigated spin accumulation in Ni/Au/Ni single-electron transistors assembled by atomic force microscopy. The fabrication technique is unique in that unconventional hybrid devices can be...
Electron-magnon coupling and nonlinear tunneling transport in magnetic nanoparticles (2005)
Michalak, L., Canali, C. M., Benza, V. G.
We present a theory of single-electron tunneling transport through a ferromagnetic nanoparticle in which particle-hole excitations are coupled to spin collective modes. The model employed to describe...
Magnetic Anisotropy of Isolated Cobalt Nanoplatelets (2005)
Strandberg, T. O., Canali, C. M., MacDonald, A. H.
Motivated in part by experiments performed by M.H. Pan et al. (nanoletters, v.5, p 83, 2005), we have undertaken a theoretical study of the the magnetic properties of two-monolayer thick Co...
Landau-Zener quantum tunneling in disordered nanomagnets (2004)
Benza, V. G., Canali, C. M., Strini, G.
We study Landau-Zener macroscopic quantum transitions in ferromagnetic metal nanoparticles containing on the order of 100 atoms. The model that we consider is described by an effective giant-spin...
Orbital and spin contributions to the $g$-tensors in metal nanoparticles (2003)
Cehovin, A., Canali, C. M., MacDonald, A. H.
We present a theoretical study of the mesoscopic fluctuations of $g$-tensors in a metal nanoparticle. The calculations were performed using a semi-realistic tight-binding model, which contains both...
Elementary Excitations of Ferromagnetic Metal Nanoparticles (2003)
Cehovin, A., Canali, C. M., MacDonald, A. H.
We present a theory of the elementary spin excitations in transition metal ferromagnet nanoparticles which achieves a unified and consistent quantum description of both collective and quasiparticle...
Chern Numbers for Spin Models of Transition Metal Nanomagnets (2003)
Canali, C. M., Cehovin, A., MacDonald, A. H.
We argue that ferromagnetic transition metal nanoparticles with fewer than approximately 100 atoms can be described by an effective Hamiltonian with a single giant spin degree of freedom. The total...
Cehovin, A., Canali, C. M., MacDonald, A. H.
We use a microscopic Slater-Koster tight-binding model with short-range exchange and atomic spin-orbit interactions that realistically captures generic features of ferromagnetic metal nanoparticles...
Theory of Tunneling Spectroscopy in Ferromagnetic Nanoparticles (2000)
Canali, C. M., MacDonald, A. H.
We present a theory of the low-energy excitations of a ferromagnetic metal nanoparticle. In addition to the particle-hole excitations, which occur in a paramagnetic metal nanoparticle, we predict a...
Disorder and interaction induced pairing in the addition spectra of quantum dots (1999)
We have investigated numerically the electron addition spectra in quantum dots containing a small number (N < 11) of interacting electrons, in presence of strong disorder. For a short-range Coulomb...
Level Curvature Distribution and the Structure of Eigenfunctions in Disordered Systems (1997)
Basu, C., Canali, C. M., Kravtsov, V. E., Yurkevich, I. V.
The level curvature distribution function is studied both analytically and numerically for the case of T-breaking perturbations over the orthogonal ensemble. The leading correction to the shape of...
Coulomb correlations and coherent charge tunneling in mesoscopic coupled rings (1997)
Canali, C. M., Stephan, W., Gorelik, L. Y., Shekhter, R. I., Jonson, M.
We study the effect of a strong electron-electron (e-e) interaction in a system of two concentric one-dimensional rings with incommensurate areas A_1 and A_2, coupled by a tunnel amplitude. For...
Ordering effect of Coulomb interaction in ballistic double-ring systems (1996)
Canali, C. M., Stephan, W., Gorelik, L. Y., Shekhter, R. I., Jonson, M.
We study a model of two concentric onedimensional rings with incommensurate areas $A_1$ and $A_2$, in a constant magnetic field. The two rings are coupled by a nonhomogeneous inter-ring tunneling...
Canali, C. M., Basu, Chaitali, Stephan, W., Kravtsov, V. E.
We compute the distribution function of single-level curvatures, $P(k)$, for a tight binding model with site disorder, on a cubic lattice. In metals $P(k)$ is very close to the predictions of the...
We consider a family of random matrix ensembles (RME) invariant under similarity transformations and described by the probability density $P({\bf H})= \exp[-{\rm Tr}V({\bf H})]$. Dyson's mean field...
Normalization Sum Rule and Spontaneous Breaking of U(N) Invariance in Random Matrix Ensembles (1995)
Canali, C. M., Kravtsov, V. E.
It is shown that the two-level correlation function $R(s,s')$ in the invariant random matrix ensembles (RME) with soft confinement exhibits a "ghost peak" at $s\approx -s'$. This lifts the sum rule...
Non-Universality in Random Matrix Ensembles with Soft Level Confinement (1994)
Canali, C. M., Wallin, Mats, Kravtsov, V. E.
Two families of strongly non-Gaussian random matrix ensembles (RME) are considered. They are statistically equivalent to a one-dimensional plasma of particles interacting logarithmically and confined...