Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2008

Идентификатор DOI: 10.1088/0022-3727/41/1/015004

Ключевые слова: Bias currents, Curie temperature, Electric power generation, Granular materials, Magnetic field effects, Microwave irradiation, Voltage measurement, Direct current voltage, Magnetic tunnel junctions, Metal insulator metal junctions, Nonmagnetic metals, Manganites

Аннотация: We demonstrate the microwave detection effect in a granular La0.7Ca0.3MnO3 sample. Dc voltage generated by the sample in response to microwave irradiation below the Curie temperature is found to be dependent on the applied magnetic field. The magnetic field dependence of the dc voltage has a broad peak resembling an absorption line. The detection effect depends substantially on the magnetic history of the sample; however, identical measurement conditions provide reproducibility of the experimental results. The detected dc voltage increases linearly with microwave power and strongly depends on a bias current through the sample. According to the results of systematic measurements, there exist two contributions to a value of the detected output signal. The first is magneto-independent; it can be explained in the framework of a mechanism used traditionally for description of the rectification effect in metal-insulator-metal junctions with nonmagnetic metals. The other is magneto-dependent; it originates from the interplay between the spin-dependent current through magnetic tunnel junctions and spin dynamics of the grains, which form these junctions in the sample.

Журнал: JOURNAL OF PHYSICS D-APPLIED PHYSICS

Выпуск журнала: Vol. 41, Is. 1

ISSN журнала: 00223727

Место издания: BRISTOL

Издатель: IOP PUBLISHING LTD

• Volkov N.V. (Siberian Federal University)
• Eremin E.V. (Kirensky Institute of Physics,Siberian Branch,Russian Academy of Sciences)
• Shaykhutdinov K.A. (Kirensky Institute of Physics,Siberian Branch,Russian Academy of Sciences)
• Tsikalov V.S. (Kirensky Institute of Physics,Siberian Branch,Russian Academy of Sciences)
• Petrov M.I. (Kirensky Institute of Physics,Siberian Branch,Russian Academy of Sciences)
• Balaev D.A. (Kirensky Institute of Physics,Siberian Branch,Russian Academy of Sciences)
• Semenov S.V. (Kirensky Institute of Physics,Siberian Branch,Russian Academy of Sciences)

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