| Magnetic and Crystalline Microstructures of Fe-Pt-B Nanocomposite Ribbons |
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| 作者姓名： | 方以坤 张正武 张文成 夏爱林 陈强 葛洪良 韩宝善 |
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| 作者单位： | [1]StateKeyLaboratoryofMagnetism,BeijingNationalLaboratoryforCondensedMatterPhysics,InstituteofPhysics,ChineseAcademyofSciences,Beijing100080 [2]DepartmentofPhysics,NationalChungChengUniversity,Ming-Hsiung,Chia-Yi [3]DepartmentofAppliedPhysics,ChinaJiliangUniversity,Hangzhou310018 |
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| 摘 要： | We investigate magnetic and crystalline microstructures of melt-spun (Fe0.675Pt0.325)100-xBx (x=12, 14, 16, 18,20) nanocomposite ribbons after optimal thermal treatment using a magnetic force microscope. The magnetic microstructures are characterized by darker spots adjacent to brighter ones in a sub-micro scale and in random distribution. It is found that the strength of the exchange coupling interaction between the crystals in the 10-100 nm scale, implied by the maximum value (δM)max of the Henkel plot, could be roughly described by the ratio of the average width of the magnetic spots w^- to the average crystal size D^- for the ribbons. Moreover, we find that the intrinsic coercivity jHc of the ribbons is sensitive to their crystal sizes, and the smaller D^-, the higher jHc. Finally, by using roughness analysis, the curve of the root mean square values (δФ)rms of the phase shift of the magnetic force images versus the boron content x is obtained, which is qualitatively consistent with that of the magnetization σ12 kOe of the ribbons versus x.
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| 关 键 词： | 磁性 晶体结构 铁-硼-铂纳米复合物 熔融自旋 |
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