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Behaviour of Internal Stress in Melt—Spun Ni—Mn—Ga Ribbons

Chinese Physics Letters 2003年第3期20卷 427-429页

作者：赵韦人李健靓等 DepartmentofPhysics ShantouUniversityShantou515063 instituteoffunctionalmaterials CentralIronandSteelResearchInstituteBeijing100081

We investigate the martensitic transition of melt-spun Ni-Mn-Ga ribbons, during which an abrupt release of internal stress occurs. The release results in the appearance of two peaks on the curve of field-induced strains versus temperature. During and after the transformation, a large lag of field-induced strains was observed, indicating a competition between the stress energy and Zeemann energy. The lag leads to an unusual relation of the strains to the inducing field.

关键词： Martensitic transformations

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Electronic Structure and Magnetism in Sm（Co,Cu）7

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Chinese Physics Letters 2005年第8期22卷 2055-2058页

作者：张昌文李华董建敏郭永权李卫 SchoolofPhysicsandMicroelectronics ShandongUniversityJinan250100 instituteoffunctionalmaterials CentralIron&SteelResearchInstituteBeijing100081

The electronic density of states, spin-splittings and atomic magnetic moments of SmCo7−xCux are studied by means of the spin-polarized multi-scattering Xα method. The results show that a few of the electrons can transfer to the Sm 5d0 orbital due to orbital hybridization between Sm and Co. The exchange interactions between 3d and 5d electrons lead to the magnetic coupling between Sm and Co, and therefore result in the long-range ferromagnetic order in SmCo7−xCux. The Curie temperature of SmCo7−xCux is generally lower than that of the corresponding pure Co, which may be explained by the weaker average strength of coupling between Co lattices due to some negative exchange couplings mainly from the 2e site. The calculated results for the Sm5Co30Cu4 cluster may lead to a better understanding of why SmCo7−xCux is stable phase. Since the negative coupling of the 2e sites becomes small and the d bond at EF becomes stronger in contrast to SmCo7, which results in decrease of the free energy of the system, the stable ferromagnetic order forms in SmCo7−xCux.

关键词： Ca Cu DOS

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Giant magnetoimpedance effect in as quenched Fe_(89-x)Zr_7B_4Cu_x(x=1.0-2.5) ribbons

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Journal of University of Science and Technology Beijing 2002年第5期9卷 383-385页

作者： BoLi KangAn 等 instituteoffunctionalmaterials CentralIron＆SteelResearchInstituteBeijing100081China Departmentofphysics ShandongUniversityJinan250100China

The giant magnetoimpedance(GMI)effect in as-quenchedFe_89-xZr_7B_4Cu_x(x=1.0-2.5)ribbons is reported. The as-quenchedFe_89-xZr_7B_4Cu_x(x=1.0-2.5)ribbons were prepared by the vacuummelt-spun processes with the quenching speed of 37 m/s. The magne-Toimpedance measurement were performance at room temperature, wherethe current flow through the length of the ribbons in the directionParallel to the dc fields. results show that values Z(impedance),R(resistance)for both H = 0 A/m and H = 5 127 A/m Increases withincreasing ac frequency. This can be explained by the skin effectmechanism.

关键词： giant magnetoimpedance effect as quenched ribbons FeZrBCu

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