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Magnetic properties of a mixed spin-3/2 and spin-2 Ising octahedral chain

Chinese Physics B 2022年第8期31卷 598-604页

作者： Xiao-Chen Na Nan Si Feng-Ge Zhang Wei Jiang School of Science Shenyang University of TechnologyShenyang 110870China School of Environmental and Chemical Engineering Shenyang University of TechnologyShenyang 110870China School of Electric Engineering Shenyang University of TechnologyShenyang 110870China

Using an effective field theory with correlations, magnetic properties of an octahedral chain described by a mixed spin Ising model are investigated. Unique phenomena such as multiple hysteresis loops, saturation magnetization, and reverse flip of the magnetization plateaus occur when certain typical parameters are applied. These results may be helpful to further investigate the magnetic properties of one-dimensional systems and could potentially be utilized in the design of spin devices.

关键词： octahedral chain magnetization plateaus hysteresis loops blocking temperature

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The effect of interface roughness on the perpendicular exchange bias of NiO/CoPt/Pt stacking structure

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Science China(Technological Sciences) 2021年第3期64卷 605-610页

作者： GAO Ying HARUMOTO Takashi NAKAMURA Yoshio SHI Ji Department of Materials Science and Engineering Tokyo Institute of Technology2-12-1OokayamaMeguro-kuTokyo 152-8550Japan

An orthogonal coupling structure of NiO/CoPt/Pt/glass with perpendicular exchange bias effect has been *** exchange bias is found to be strongly dependent on the interface roughness between NiO and CoPt *** conventional inverse proportionality of the exchange bias field with the ferromagnetic thickness is not applicable to this top-pinned stacking ***,an anomalous ferromagnetic thickness dependence of blocking temperature is also observed.A simulation on the basis of a spin configuration model with defects at the interface agrees well with the experimental *** findings suggest considerable contribution of the interface roughness to the perpendicular exchange bias.

关键词： perpendicular exchange bias interface roughness FM thickness blocking temperature

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Structure and magnetic properties of a new single-molecule magnet [Mn11Fe1O12 （CH3COO）16（H2O）4]·2CH3COOH·4H2O

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Chinese Physics B 2005年第9期14卷 1892-1895页

作者：曹慧波何伦华王芳卫 State Key Laboratory for Magnetism Institute of Physics Chinese Academy of Sciences Beijing 100080 China

A new single-molecule magnet [Mn11Fe1O12 （CH3COO）16（H2O）4]·2CH3COOH·4H2O （Mn11Fe1） has been synthesized. The structure has been studied by the single crystal x-ray diffraction. The difference of Jahn-Teller distortion between Fe^3＋ and Mn^3＋ ion reveals that Fe^3＋ ion substitutes for Mn^3＋ ion on the Mn（3） sites in the Mn12 skeleton. The temperature dependence of the magnetization gives a blocking temperature TB=1.9K for Mn11Fe1. Based on the magnetization process analysis of the crystal at T=2K, we suggest that Mn11Fe1 has the ground state with a total spin S=11/2.

关键词： quantum tunnelling Jahn-Teller distortion blocking temperature

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