journal article·2015-11-01Open access

Molecular beam epitaxy growth and magnetic properties of Cr-Co-Ga Heusler alloy films

Wuwei Feng, Weihua Wang, Chenglong Zhao, Nguyen Van Quang, Sunglae Cho, Dang Duc Dung

AIP Advances· Volume 5· Issue 11

Abstract

We have re-investigated growth and magnetic properties of Cr2CoGa films using molecular beam epitaxy technique. Phase separation and precipitate formation were observed experimentally again in agreement with observation of multiple phases separation in sputtered Cr2CoGa films by M. Meinert et al. However, significant phase separation could be suppressed by proper control of growth conditions. We showed that Cr2CoGa Heusler phase, rather than Co2CrGa phase, constitutes the majority of the sample grown on GaAs(001) at 450 oC. The measured small spin moment of Cr2CoGa is in agreement with predicted HM-FCF nature; however, its Curie temperature is not as high as expected from the theoretical prediction probably due to the off-stoichiometry of Cr2CoGa and the existence of the disorders and phase separation.
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Research context

OpenAlex topics: Heusler alloys: electronic and magnetic properties · GaN-based semiconductor devices and materials · Magnetic and transport properties of perovskites and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

China University of Geosciences 1 School of Materials Science and Technology, , Beijing 100083, China

Chinese Academy of Sciences 2 Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, , Beijing 100190, China

University of Ulsan 3 Department of Physics, , Ulsan 680-749, South Korea

Ha Noi University of Science and Technology 4 Department of General Physics, School of Engineering Physics, , 1 Dai Co Viet Road, Ha Noi, Vietnam

Funding

Fundamental Research Funds for the Central Universities · Korea Institute of Energy Technology Evaluation and Plannin · Ph. D. Programs Foundation of Ministry of Education of China · National Natural Science Foundation of China

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