2016 Research in the Capitol

Presentation Type

Open Access Poster Presentation

Keywords

Titanium alloys--Properties; Semiconductors--Materials; Spintronics;

Abstract

In recent years, ever increasing interest in spin-based electronics (spintronics) has resulted in the search for a new class of materials that can provide a high degree of transport spin polarization. An ideal candidate would act like insulator for one spin channel and a conductor or semiconductor for the opposite spin channel (e.g. half metals (HM), spin gapless semiconductors (SGS)). In this work, we present results of our computational and theoretical study (Staten, et al., J. Appl. Phys. 117, 17D115 (2015)) of Heusler compounds with potential commercial applications in the field of spintronics. We show that naturally these materials are metallic, however they may become SGS or HM when 50% of Al is substituted with In or Sn. Detailed study of the structural, electronic, and magnetic properties of these materials is presented. These properties are in good agreement with our preliminary experimental results.

Start Date

29-3-2016 11:30 AM

End Date

29-3-2016 1:30 PM

Event Host

University Honors Programs, Iowa Regent Universities

Faculty Advisor

Pavel Lukashev

Department

Department of Physics

Comments

Location: Iowa State House, Rotunda, Des Moines, Iowa

File Format

application/pdf

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Mar 29th, 11:30 AM Mar 29th, 1:30 PM

Spin-gapless semiconductivity and half metallicity in Heusler alloys

In recent years, ever increasing interest in spin-based electronics (spintronics) has resulted in the search for a new class of materials that can provide a high degree of transport spin polarization. An ideal candidate would act like insulator for one spin channel and a conductor or semiconductor for the opposite spin channel (e.g. half metals (HM), spin gapless semiconductors (SGS)). In this work, we present results of our computational and theoretical study (Staten, et al., J. Appl. Phys. 117, 17D115 (2015)) of Heusler compounds with potential commercial applications in the field of spintronics. We show that naturally these materials are metallic, however they may become SGS or HM when 50% of Al is substituted with In or Sn. Detailed study of the structural, electronic, and magnetic properties of these materials is presented. These properties are in good agreement with our preliminary experimental results.