作者: Wei, QQ (Wei, Qiqi); Wang, HL (Wang, Hailong); Ma, JL (Ma, Jialin); Zhao, XP (Zhao, Xupeng); Zhao, JH (Zhao, Jianhua)

来源出版物: JOURNAL OF PHYSICS-CONDENSED MATTER 卷: 33 期: 31 文献号: 315702 DOI: 10.1088/1361-648X/ac03d4 出版年: AUG 4 2021

摘要: The magneto-transport properties of cubic NiMnAs film epitaxied on the GaAs (110) substrate are investigated. The x-ray diffraction measurements reveal that the NiMnAs (111) crystal plane is parallel to the GaAs (110) crystal plane. The temperature dependence of resistivity at high temperature can be described by a thermal activation model, from which the thermal activation energy is obtained and found to be comparable with many other Heusler alloys. By fitting the temperature dependence of resistivity at low temperature, the coefficient of the quadratic temperature term is determined to be 1.34 x 10(-3) mu omega cm K-2. This value suggests the possible presence of single-magnon scattering in the NiMnAs film. The negative magnetoresistance is attributed to the suppression of the spin-dependent scattering, which would not take place in a half-metal. The angle dependence of the anisotropic magnetoresistance (AMR) is measured, and the AMR ratios are positive even at low temperature. These magneto-transport properties indicate that the predicted half-metallicity is destroyed in the NiMnAs film. The absence of the half-metallicity may be attributed to the atomic disorder in the NiMnAs lattice, which needs to be confirmed by further experimental and theoretical studies.

入藏号: WOS:000662034300001

PubMed ID: 34020432

作者识别号:

作者        Web of Science ResearcherID        ORCID 号

wang, hai long                  0000-0001-9884-4460

ISSN: 0953-8984

eISSN: 1361-648X

Full Text: https://iopscience.iop.org/article/10.1088/1361-648X/ac03d4