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实验研究了石榴石磁泡薄膜中不同脉冲宽度下产生的硬磁畴的动态特性.结果表明:由零偏场下产生的枝状畴收缩而成的哑铃畴均逆时针转动,与产生枝状畴时所用的脉冲偏场的脉冲宽度无关.而固定直流偏场下由软畴段硬化而成的哑铃畴的转动状态,则与所用的硬化脉冲偏场的脉冲宽度有关.低脉冲宽度下硬化成的哑铃畴均逆时针转动,随硬化脉冲宽度的升高,出现混合转动向顺时针转动的过渡.由此揭示了直流偏场和脉冲偏场在石榴石磁泡薄膜中形成正、负垂直布洛赫线的作用.
关键词:
磁畴
磁泡
垂直布洛赫线 相似文献
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ANNIHILATION OF VERTICAL-BLOCH-LINE CHAINS IN THE WALLS OF ORDINARY HARD BUBBLES SUBJECTED TO JOINT STATIC BIAS FIELD AND IN-PLANE FIELD 下载免费PDF全文
For the ordinary hard bubbles(OHBs) of garnet bubble films, the annihilation of the vertical-Bloch line (VBL) chains in their walls subjected to joint static bias field Hb and in plane field Hip was experimentally studied. The curves of two critical in-plane fields, H(1)ip and H′ip, vs Hb were measured. By means of the so-called "head-cut" and "tail-cut" experiments designed in this work, it was verified that for the OHBs subjected to Hip, their VBL chains with different lengths lose VBLs and become shorter simultaneously. It was also verified that the critical in-plane fields H(1)ipand H′ip correspond to the break down of the shortest and longest VBL chains of OHBs, respectively. 相似文献
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应用经典场论和耦合模理论计算了斜向静磁场作用下,磁性薄膜波导中静磁波与导波光的相互作用.计算结果表明,与垂直静磁场情形相比,斜向静磁场时的相匹配条件有所变化,由于磁性薄膜波导中法拉第磁光效应增强等因素,导波光的Bragg衍射效率得以显著增加.这有利于应用YIG等低损耗磁性薄膜做成高衍射效率的磁光波导器件,亦有利于降低Bi∶YIG等高比法拉第旋转的磁光薄膜波导器件的体积和损耗.此外,理论指出的在斜向静磁场条件下所具有的一些磁光特性与实验结果亦符合得很好.
关键词: 相似文献
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理论计算表明,与垂直静磁场情形相比,斜向静磁场可以明显增强磁性薄膜波导中的法拉第效应,同时会引起静磁波共振频率和带宽等许多静磁波特性的变化.合理利用这些变化特性,可望大幅度提高导波光的衍射效率,改善磁光波导器件的特性.
关键词: 相似文献