Spin polarization in Heusler alloy films

Yukiko K. Takahashi, Kazuhiro Hono

研究成果: Chapter

1 被引用数 (Scopus)

抄録

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.

本文言語English
ホスト出版物のタイトルSpringer Series in Materials Science
出版社Springer Verlag
ページ295-318
ページ数24
DOI
出版ステータスPublished - 2016 1 1
外部発表はい

出版物シリーズ

名前Springer Series in Materials Science
222
ISSN(印刷版)0933-033X

ASJC Scopus subject areas

  • 材料科学(全般)

フィンガープリント

「Spin polarization in Heusler alloy films」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル