Crossover from antiferromagnetic to ferromagnetic ordering in the semi-Heusler alloys Cu1-xNixMnSb with increasing Ni concentration

Article

关键词: HALF-METALLIC FERROMAGNETS;    NEUTRON DEPOLARIZATION;    MAGNETIC-STRUCTURE;    PHASE;    CUXNI1-XMNSB;    TRANSITION;    DOMAINS;    SYSTEM;    NIMNSB;   

DOI  :  10.1103/PhysRevB.84.094435

来源: SCIE

【 摘 要 】

The magnetic properties and transition from an antiferromagnetic (AFM) to a ferromagnetic (FM) state in semi-Heusler alloys Cu1-xNixMnSb, with x < 0.3 have been investigated in detail by dc magnetization, neutron diffraction, and neutron depolarization. We observe that for x < 0.05, the system Cu1-xNixMnSb is mainly in the AFM state. In the region 0.05 <= x <= 0.2, with decrease in temperature, there is a transition from a paramagnetic to a FM state, and below similar to 50 K, both AFM and FM phases coexist. With an increase in Ni substitution, the FM phase grows at the expense of the AFM phase, and for x > 0.2, the system fully transforms to the FM phase. Based on the results obtained, we have performed a quantitative analysis of both magnetic phases and propose a magnetic phase diagram for the Cu1-xNixMnSb series in the region x < 0.3. Our study gives a microscopic understanding of the observed crossover from the AFM to FM ordering in the studied semi-Heusler alloys Cu1-xNixMnSb.

【 授权许可】

Free