Magnetic structure and magnetization process of NdCo(12-x)V(x)

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	Magnetic structure and magnetization process of NdCo(12-x)V(x)
	G. H. Rao; W. F. Liu; Q. Huang; Z. W. Ouyang; F. W. Wang; Y. G. Xiao; J. W. Lynn; J. K. Liang
	2005
发表期刊	Physical Review B
ISSN	1098-0121
卷号	71 期号:14
摘要	NdCo(12-x)V(x) (2.2 <= x <= 2.6) crystallizes in the ThMn(12)-type structure and exhibits an unusual jump in the magnetization at a critical field B(C) that decreases with increasing V content. It was intriguing that the magnetization of the bulk samples below B(C) was very close to that of YCo(12-x)V(x) with the same V content. To investigate the nature of the magnetic order in these materials we have carried out powder neutron diffraction measurements as a function of temperature and magnetic field on the NdCo(9.5)V(2.5) composition. In zero field we find that both the Nd and Co ions have substantial ordered moments (similar to 2.9 and 0.4 mu(B), respectively) at low temperature (4 K), with the moments coupled ferromagnetically (T(C)=180 K) and aligned along the c axis. On a loose powder an applied field of 4 to 7 T rotates the particles so the c axis aligns with the field, indicating a strong uniaxial anisotropy that renders the system Ising-like. However, we find the same in-field magnetic structure and essentially the same values for the saturated magnetic moments as those in zero field. Magnetization data on magnetically prealigned samples reveal that for fields applied parallel to the (easy) c axis the magnetization saturates below 0.5 T at a magnitude that is in very good agreement with the moments determined from neutron diffraction. For fields applied perpendicular to the c axis, on the other hand, the magnetization data show a two-plateau behavior, explaining the original magnetization data on randomly oriented powders. The strong dependence of the magnetization on the direction of the applied magnetic fields indicates an occurrence of the first-order magnetization process due to the competing magnetocrystalline anisotropies of the Nd and the Co sublattices and of the higher-order terms of the anisotropy energy.
部门归属	chinese acad sci, inst phys, beijing natl lab condensed matter phys, beijing 100080, peoples r china. natl inst stand & technol, nist ctr neutron res, gaithersburg, md 20899 usa. acad sinica, int ctr mat phys, shenyang 110016, peoples r china.;rao, gh (reprint author), chinese acad sci, inst phys, beijing natl lab condensed matter phys, pob 603, beijing 100080, peoples r china
关键词	Rare-earth Intermetallic Compounds Thmn12 Structure Transition Anisotropy Crystal Fe Substitution Ndco9.5v2.5 Compound
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/35016
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	G. H. Rao,W. F. Liu,Q. Huang,et al. Magnetic structure and magnetization process of NdCo(12-x)V(x)[J]. Physical Review B,2005,71(14).
APA	G. H. Rao.,W. F. Liu.,Q. Huang.,Z. W. Ouyang.,F. W. Wang.,...&J. K. Liang.(2005).Magnetic structure and magnetization process of NdCo(12-x)V(x).Physical Review B,71(14).
MLA	G. H. Rao,et al."Magnetic structure and magnetization process of NdCo(12-x)V(x)".Physical Review B 71.14(2005).