O.M. Stewart Colloquium Series presents: Pavel Lukashev

Monday, February 5, 2018 4:00pm

Room 120 Physics Building

Departments: 

The MU Physics & Astronomy Department's O. M. Stewart Colloquium Series presents, "Half-metallicity in Heusler Alloys: Recent Developments and Prospects," Monday, Feb. 5, 2018, 4:00 p.m.

Prof. Pavel Lukashev, U. Northern Iowa

Prof. Pavel Lukashev, University of Northern Iowa, offers a preview of his talk:

"In recent years, a search for materials exhibiting robust half-metallicity at ambient conditions has been one of the most technologically appealing developments in condensed matter physics and materials science. A half-metal is a material that behaves as an insulator for one spin channel and as a conductor for the opposite spin channel. Such materials are said to be 100% spin-polarized, and are particularly appealing in spintronics ? an emerging technology utilizing a spin degree of freedom in electronic devices. Most of the materials reported to exhibit half-metallicity or near half-metallicity belong to the class of Heusler alloys. It has been also demonstrated in certain oxides (CrO2 and Fe3O4), manganites (La0.7Sr0.3MnO3), chalcogenides (EuN), etc. However, for practical applications Heusler alloys are especially appealing, as in general they demonstrate higher Curie temperature compared to most of the other reported half-metals. I will present my recent theoretical work on structural, magnetic, and electronic properties of these materials, and will compare theoretical results with experimental findings.

In particular, I will discuss various physical mechanisms, such as atomic disorder, chemical substitution, mechanical strain, and reduced (thin film) geometry, which affect the degree of spin-polarization in potentially half-metallic compounds."

Refreshments will be served beginning at 3:30 p.mm in Room 223A, Physics Library.