Switching processes and switching reproducibility in ferromagnetic ring structures
Switching processes and switching reproducibility in ferromagnetic ring structures
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DOI：
10.1063/1.1640451
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发表时间：
2004-02-09
影响因子：
4
通讯作者：
David, C
中科院分区：
文献类型：
--
作者：
Kläui, M;Vaz, CAF;David, C
我们对环中发生的不同切换过程的重复性进行了实验研究。利用超导量子干涉装置和磁阻测量，我们可以测量环阵列和单个结构在不同温度下的磁滞回线，从而分离热激发和缺陷(外在和本征)的影响。我们发现，切换场及其分布的温度依赖性可以与不同相变过程中发生的不同物理过程相关联。对单环开关场的角度依赖性的测量使我们能够区分外在缺陷和本征缺陷对开关场分布的贡献，并且，与直觉相反的是，我们发现，涉及成核过程的相变比涉及磁壁或涡核脱钉和传播的过程更不容易发生缺陷和热激发。(C)2004年美国物理研究所。
We present an experimental study of the reproducibility of the different switching processes occurring in rings. Using superconducting quantum interference device and magnetoresistance measurements, we can measure hysteresis loops of arrays of rings and single structures at varying temperatures and thereby separate the influence of thermal excitations and defects (extrinsic and intrinsic). We find that the temperature dependence of the switching fields and their distributions can be correlated with the different physical processes occurring during different transitions. Measurements of the angular dependence of the switching fields of a single ring allow us to distinguish the contributions of extrinsic and intrinsic defects to the switching field distributions and, counterintuitively, it is established that transitions involving nucleation processes are less prone to defects and thermal excitations than processes involving domain-wall or vortex core depinning and propagation. (C) 2004 American Institute of Physics.