Spin polarization in Heusler alloy films

Yukiko K. Takahashi*, Kazuhiro Hono

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Citation (Scopus)

Abstract

Spin polarization measurements are essential for searching new alloys with high spin polarization. While tunneling magnetoresistance (TMR) measurements have been used to estimate the spin polarization of ferromagnetic (FM) electrodes of magnetic tunneling junctions (MTJs), it requires thin film stack and tedious microfabrication processes to prepare TMR pillars. On the other hand, point contact Andreev reflection (PCAR) can estimate current spin polarizations of bulk alloys relatively easily. Low temperature spin polarization of a series of quaternary substitutional alloys, Co2Y(Z1 xx), designed based on the Fermi level tuning, have been investigated using PCAR. Promising alloys were screened and they were evaluated as ferromagnetic (FM) layers of current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) pseudo spin valves. Some quaternary Heusler alloys, such as Co2Fe(Al0.5Si0.5), Co2Mn(Ge0.75Ga0.25) and Co2Fe(Ge0.5Ga0.5) were found to be excellentFMlayer forCPP-GMR. Recent theoretical and experimental investigations on the correlation between anisotropy magnetoresistance (AMR) and MR outputs suggest that AMR measurements will be more effective way for screening alloys for high spin polarization, as it can estimate spin polarization at finite temperatures.

Original languageEnglish
Title of host publicationSpringer Series in Materials Science
PublisherSpringer Verlag
Pages295-318
Number of pages24
DOIs
Publication statusPublished - 2016 Jan 1
Externally publishedYes

Publication series

NameSpringer Series in Materials Science
Volume222
ISSN (Print)0933-033X

ASJC Scopus subject areas

  • Materials Science(all)

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