几何尺寸对玻璃包覆铁磁合金微丝性能影响的分析及模拟

根据玻璃包覆合金微丝内应力的来源,分析了合金与玻璃层的热膨胀系数差异产生的内应力与玻璃包覆层和合金的杨氏模量、热膨胀系数以及尺寸的关系.通过计算不同合金芯直径和玻璃包覆层厚度时合金微丝不同径向位置处的内应力,建立了理想无限长玻璃包覆Fe基和CoFe基合金微丝的磁畴结构模型.模拟研究了玻璃包覆层厚度与合金芯半径的比值对内应力及磁各向异性的影响规律.结果表明,高饱和磁致伸缩系数和高的玻璃包覆层恰金芯半径比值使玻璃包覆合金微丝具有高内应力,最终导致高的磁各向异性等效场.

Analysis and simulation of the effect of dimensions on the properties of glass-coated magnetic alloy microwires

The relation of internal stress resulting from discrepancy of thermal expansion coefficient between the alloy core,glass cover layer and Young’s modulus,thermal expansion coefficient,and the dimension of the glass-coated alloy microwires is investigated by analyzing of the origination of internal stress of glass-coated alloy microwires.The magnetic domain structure model of glass-coated Fe-rich and CoFe-rich alloy microwires with perfectly infinite length is established by calculating the internal stress of different radial location of glass-coated alloy microwires with different alloy core diameter and glass cover thickness.The effect of ratio of glass cover thickness to alloy core diameter on the internal stress and magnetic anisotropy is simulated.The result showed that higher saturation magnetostrictive coefficient and ratio of higher glass cover thickness to alloy core radius ratio causes the higher internal stress of glass-coated alloy microwires,and thus results in higher magnetic anisotropy field.