Microwave-induced spin-flip scattering of electrons in point contacts

• Date: 2011
• Main Authors: Kadigrobov, A.M., Shekhter, R.I., Aronov, I., Kulinich, S.I., Pulkin, A., Jonson, M.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2011
• Series: Физика низких температур
• Subjects: Современные проблемы низкотемпературной физики конденсированного состояния
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/118791
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Microwave-induced spin-flip scattering of electrons in point contacts / A.M. Kadigrobov, R.I. Shekhter, I. Aronov, S.I. Kulinich, A. Pulkin, M. Jonson // Физика низких температур. — 2011. — Т. 37, № 11. — С. 1163–1172. — Бібліогр.: 19 назв. — англ.

We investigate resonant interaction of conduction electrons with an electromagnetic field that irradiates a point contact between a ferromagnetic and a normal metal in the presence of a strong magnetic field of order 1 T. We show that electron spin-flips caused by resonant absorption and stimulated emission of photons result in a sharp peak in the magnetic-field dependence of the point-contact resistance. The height of the peak is shown to be directly proportional to the net rate of energy transfer to the electromagnetic field in the point contact due to absorption and stimulated emission of photons. Estimations indicate that our theory can serve as a basis for the explanation of recent experiments [A.M. Kadigrobov et al., New J. Phys. 13, 023007 (2011)].