Electromagnetic proximity effect in planar superconductor-ferromagnet structures
Mironov S., Mel'nikov A. S., Buzdin A.
Applied Physics Letters
Vol.113, Issue2, Num.022601
Опубликовано: 2018
Тип ресурса: Статья
Аннотация:
The spread of Cooper pairs in a ferromagnet in proximity coupled superconductor-ferromagnet structures is shown to cause a strong inverse electromagnetic phenomenon, namely, the long-range transfer of the magnetic field from the ferromagnet to the superconductor. Contrary to the previously investigated inverse proximity effect resulting from the spin polarization of a superconducting surface layer, the characteristic length of the above inverse electrodynamic effect is of the order of the London penetration depth, which usually is much larger than the superconducting coherence length. The corresponding spontaneous currents appear even in the absence of the stray field of the ferromagnet and are generated by the vector-potential of magnetization near the S/F interface, and they should be taken into account in the design of nanoscale S/F devices. Similarly to the well-known Aharonov-Bohm effect, the discussed phenomenon can be viewed as a manifestation of the role of vector potential in
Ключевые слова:
Ferromagnetic materials; Ferromagnetism; Magnets; Spin polarization; Aharonov-bohm effects; Characteristic length; Electrodynamic effects; Electromagnetic phenomena; Ferromagnet structures; London penetration depth; Proximity effects; Superconducting coherence length; Superconducting materials
Язык текста: Английский
ISSN: 1077-3118
Mironov S.
Mel'nikov A. S.
Buzdin A. Aleksandr 1954-
Миронов С.
Мел'ников А. С.
Буздин А. Александр 1954-
Electromagnetic proximity effect in planar superconductor-ferromagnet structures
Текст визуальный непосредственный
Applied Physics Letters
American Institute of Physics
Vol.113, Issue2 Num.022601
2018
Статья
Ferromagnetic materials Ferromagnetism Magnets Spin polarization Aharonov-bohm effects Characteristic length Electrodynamic effects Electromagnetic phenomena Ferromagnet structures London penetration depth Proximity effects Superconducting coherence length Superconducting materials
The spread of Cooper pairs in a ferromagnet in proximity coupled superconductor-ferromagnet structures is shown to cause a strong inverse electromagnetic phenomenon, namely, the long-range transfer of the magnetic field from the ferromagnet to the superconductor. Contrary to the previously investigated inverse proximity effect resulting from the spin polarization of a superconducting surface layer, the characteristic length of the above inverse electrodynamic effect is of the order of the London penetration depth, which usually is much larger than the superconducting coherence length. The corresponding spontaneous currents appear even in the absence of the stray field of the ferromagnet and are generated by the vector-potential of magnetization near the S/F interface, and they should be taken into account in the design of nanoscale S/F devices. Similarly to the well-known Aharonov-Bohm effect, the discussed phenomenon can be viewed as a manifestation of the role of vector potential in