186th Special MMU Seminar


High Spin Polarization Materials for CPP-GMR devices: theory of magnetic properties

Prof. Oleg N. Mryasov
Department of Physics & MINT Center, The University of Alabama
Tuscaloosa, AL, USA
Date: Tuesday, July 16, 2013
Time: 10:30 - 11:40
Place: 6th floor medium seminar room, Sengen

In this presentation I focus on theory and simulations of inter-metallic high spin polarization materials and CPP-GMR hetero-nano-structures. We focus on the following selected key properties of these materials and heterostructures: (1) spin dependence electronic structure (band gap, band matching); (2) dependence of electronic structure on alloying; (3) conductance spin polarization in bulk; (4) conductance spin polarization for CPP-GMR hetero-structures; (5) Curie temperature and magnetization. The set of high spin polarization material selected for this presentation include: (i) Ternary and Quaternary cubic symmetry Heusler alloys; (ii) perpendicular anisotropy materials such as hexagonal Mn-Bi and other alloys based on hcp symmetry. We discuss mechanism of high spin polarization and perpendicular anisotropy contrasting different solutions for different prospective devices utilizing spin degrees of freedom.