Irreversible magnetization switching at the onset of superconductivity in a superconductor ferromagnet hybrid
Irreversible magnetization switching at the onset of superconductivity in a superconductor ferromagnet hybrid
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DOI：
10.1063/1.4938467
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发表时间：
2015-12
影响因子：
4
通讯作者：
P. Curran;Jang-Whan Kim;N. Satchell;J. Witt;G. Burnell;M. Flokstra;Steve Lee;J. Cooper;C. Kinane;S. Langridge;A. Isidori;N. Pugach;M. Eschrig;S. Bending
中科院分区：
文献类型：
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作者：
P. Curran;Jang-Whan Kim;N. Satchell;J. Witt;G. Burnell;M. Flokstra;Steve Lee;J. Cooper;C. Kinane;S. Langridge;A. Isidori;N. Pugach;M. Eschrig;S. Bending
我们证明了超导自旋阀的磁状态，这是通常控制与外部磁场，也可以通过改变温度，增加了功能和灵活性的开关元件等结构来操纵。在这种情况下，开关由静磁能的变化驱动，静磁能的变化是由于超导体中在临界温度以下形成的自发迈斯纳屏蔽电流引起的。我们的扫描霍尔探针测量也揭示了涡旋介导的钉扎的铁磁畴结构由于钉扎的量子化杂散场在相邻的超导体。利用温度和磁场来控制局部磁化结构的能力提高了磁存储器件的潜在应用的前景。
We demonstrate that the magnetic state of a superconducting spin valve, that is normally controlled with an external magnetic field, can also be manipulated by varying the temperature which increases the functionality and flexibility of such structures as switching elements. In this case, switching is driven by changes in the magnetostatic energy due to spontaneous Meissner screening currents forming in the superconductor below the critical temperature. Our scanning Hall probe measurements also reveal vortex-mediated pinning of the ferromagnetic domain structure due to the pinning of quantized stray fields in the adjacent superconductor. The ability to use temperature as well as magnetic field to control the local magnetisation structure raises the prospect of potential applications in magnetic memory devices.