Zhiyong Zhu
Chinese Academy of Sciences
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Featured researches published by Zhiyong Zhu.
Journal of Physics D | 2008
Hongzhi Luo; Zhiyong Zhu; Li Ma; Shifeng Xu; Xiaoxi Zhu; Chengbao Jiang; Huibin Xu; Guangheng Wu
The site preference of 3d atoms Y in Mn2YAl (Y = V, Fe, Co) alloys and its influence on their electronic structures and magnetism have been studied by first-principles calculations. The results prove that elements with more valence electrons than Mn tend to enter the A (0, 0, 0) and C (½, ½, ½) sites and elements with fewer electrons prefer the B (¼, ¼, ¼) site (Wyckoff positions). Meanwhile, it is found that for Mn2VAl and Mn2FeAl, a high spin polarization can be obtained whether the Y atom enters the (A, C) or the B site. In particular, Mn2VAl is half-metallic whether it forms the Cu2MnAl type or the Hg2CuTi type of structure. And a 100% spin polarization can be retained even when a 25% Mn–V antisite disorder occurs. This is quite preferable in practical applications. It is also found that the higher-valent element such as Co at the B (¼, ¼, ¼) site has opposite effects and tends to close the energy gap. Finally, a systemic summarization on the electronic and magnetic properties of Mn2YAl (Y = Ti, V, Cr, Mn, Fe and Co) alloys was made. All of them except for Mn2TiAl are predicted as half-metals. The calculated total spin moment is an integral value and increases from −3µB/f.u. for Mn2TiAl to +2µB/f.u. for Mn2CoAl with increasing number of valence electrons. This agrees with the Slater–Pauling curve quite well. All the Mn2YAl alloys studied here are ferrimagnets.
Applied Physics Letters | 2009
Zhiyong Zhu; Siu Wing Or; Guangheng Wu
The anomalous Hall effect (AHE) in quarternary Heusler-type Ni50Mn17Fe8Ga25 melt-spun ribbons is investigated. Experimental correlation between saturated anomalous Hall resistivity (ρAMS) and longitudinal resistivity (ρxx) is achieved for the low-temperature martensitic phase and the high-temperature austenitic phase as ρAMS∞ρxxn=4.2 and ρAMS∞ρxxn=2.1, respectively. The unexpectedly large exponent of n=4.2 in the martensitic phase is found to contradict the traditional theory of AHE with n=1–2, but it can be explained by a side-jump model beyond the short-range limit as a result of the intermediate-range spin-dependent electron scattering by relatively large Mn-rich clusters instead. The restoration of the exponent back to a normal value of n=2.1 in the austenitic phase is ascribed to the domination of the electron scattering by phonons, compared to that by the Mn-rich clusters, at elevated temperatures and with phonon softening in the transverse-acoustic TA2 mode.
Journal of Magnetism and Magnetic Materials | 2008
Hongzhi Luo; Zhiyong Zhu; Guodong Liu; Shifeng Xu; Guangheng Wu; Heyan Liu; Jingping Qu; Yangxian Li
Physica B-condensed Matter | 2008
Hongzhi Luo; Li Ma; Zhiyong Zhu; Guangheng Wu; Heyan Liu; Jingping Qu; Yangxian Li
Physica B-condensed Matter | 2008
Hongzhi Luo; Zhiyong Zhu; Guodong Liu; Shifeng Xu; Guangheng Wu; Heyan Liu; Jingping Qu; Yangxian Li
Journal of Magnetism and Magnetic Materials | 2008
Hongzhi Luo; Zhiyong Zhu; Li Ma; Shifeng Xu; Guangheng Wu; Heyan Liu; Jingping Qu; Yangxian Li; Xiaoxi Zhu; Chengbao Jiang; Huibin Xu
Scripta Materialia | 2004
Zongshun Liu; J.L. Chen; Haiying Hu; M. Zhang; X. Dai; Zhiyong Zhu; G. D. Liu; Guangheng Wu; F. B. Meng; Yangxian Li
Chemistry Letters | 2007
Xiaoxu Liu; Jianling Zhao; Yangxian Li; Shifeng Xu; Zhiyong Zhu; Jinglan Chen; Guangheng Wu
Archive | 2006
Guodong Liu; X. Dai; Zhuhong Liu; Zhiyong Zhu; Jinglan Chen; Guangheng Wu
Archive | 2009
S. Y. Yu; Hongzhi Luo; Zhiyong Zhu; Guodong Liu; Jinglan Chen; Guangheng Wu