Direct observation of high spin polarization in Co2FeAl thin films

被引：30

作者：

Zhang, Xiaoqian ^{[1
]}

Xu, Huanfeng ^{[1
]}

Lai, Bolin ^{[1
]}

Lu, Qiangsheng ^{[2
,3
]}

Lu, Xianyang ^{[4
]}

Chen, Yequan ^{[1
]}

Niu, Wei ^{[1
]}

Gu, Chenyi ^{[5
,6
]}

Liu, Wenqing ^{[1
,4
]}

Wang, Xuefeng ^{[1
]}

Liu, Chang ^{[2
]}

Nie, Yuefeng ^{[5
,6
]}

He, Liang ^{[1
]}

Xu, Yongbing ^{[1
,4
]}

机构：

[1] Nanjing Univ, Sch Elect Sci & Engn, Collaborat Innovat Ctr Adv Microstruct, Jiangsu Prov Key Lab Adv Photon & Elect Mat, Nanjing 210093, Jiangsu, Peoples R China

[2] Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China

[3] Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA

[4] Univ York, Dept Elect, York Nanjing Joint Ctr YNJC Spintron & Nano Engn, York YO10 3DD, N Yorkshire, England

[5] Nanjing Univ, Coll Engn & Appl Sci, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[6] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China

来源：

SCIENTIFIC REPORTS | 2018年 / 8卷

基金：

中国国家自然科学基金;

关键词：

HALF-METALLICITY; TEMPERATURE; FE;

D O I：

10.1038/s41598-018-26285-9

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We have studied the Co2FeAl thin films with different thicknesses epitaxially grown on GaAs (001) by molecular beam epitaxy. The magnetic properties and spin polarization of the films were investigated by in-situ magneto-optic Kerr effect (MOKE) measurement and spin-resolved angle-resolved photoemission spectroscopy (spin-ARPES) at 300 K, respectively. High spin polarization of 58% (+/- 7%) was observed for the film with thickness of 21 unit cells (uc), for the first time. However, when the thickness decreases to 2.5 uc, the spin polarization falls to 29% (+/- 2%) only. This change is also accompanied by a magnetic transition at 4 uc characterized by the MOKE intensity. Above it, the film's magnetization reaches the bulk value of 1000 emu/cm(3). Our findings set a lower limit on the thickness of Co2FeAl films, which possesses both high spin polarization and large magnetization.

引用

页数：6

共 28 条

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