Aleksander L. Wysocki

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The coupling between the magnetic and electric dipoles in multiferroic and magnetoelectric materials holds promise for conceptually novel electronic devices. This calls for the development of local probes of the magnetoelectric response, which is strongly affected by defects in magnetic and ferroelectric ground states. For example, multiferroic hexagonal(More)
We report the direct observation of surface magnetization domains of the magnetoelectric Cr(2)O(3) using photoemission electron microscopy with magnetic circular dichroism contrast and magnetic force microscopy. The domain pattern is strongly affected by the applied electric field conditions. Zero-field cooling results in an equal representation of the two(More)
The discovery of superconductivity in LaFeAsO introduced the ferropnictides as a major new class of superconducting compounds with critical temperatures second only to cuprates. The presence of magnetic iron makes ferropnictides radically different from cuprates. Antiferromagnetism of the parent compounds strongly suggests that superconductivity and(More)
Pavel V. Lukashev,1 Aleksander L. Wysocki,1,2 Julian P. Velev,3 Mark van Schilfgaarde,4 Sitaram S. Jaswal,1 Kirill D. Belashchenko,1 and Evgeny Y. Tsymbal1,* 1Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, USA 2School of Applied Engineering Physics, Cornell University,(More)
Spin injection from a half-metallic electrode in the presence of thermal spin disorder is analyzed using a combination of random matrix theory, spin-diffusion theory, and explicit simulations for the tight-binding s-d model. It is shown that efficient spin injection from a half-metal is possible as long as the effective resistance of the normal metal does(More)
First-principles microscopic model of exchange-driven magnetoelectric response with application to Cr 2 O 3 " (2014). Kirill Belashchenko Publications. Paper 26. The exchange-driven contribution to the magnetoelectric susceptibilityˆα is formulated using a microscopic model Hamiltonian coupling the spin degrees of freedom to lattice displacements and(More)