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High sensitivity detection of radio-frequency modulated magnetic moment in semiconductors

Guite, Chinkhanlun and Venkataraman, V (2011) High sensitivity detection of radio-frequency modulated magnetic moment in semiconductors. In: Review of Scientific Instruments, 82 (10).

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An experimental setup has been realized to measure weak magnetic moments which can be modulated at radio frequencies (similar to 1-5 MHz). Using an optimized radio-frequency (RF) pickup coil and lock-in amplifier, an experimental sensitivity of 10(-15) Am(2) corresponding to 10(-18) emu has been demonstrated with a 1 s time constant. The detection limit at room temperature is 9.3 x 10(-16) Am(2)/root Hz limited by Johnson noise of the coil. The setup has been used to directly measure the magnetic moment due to a small number (similar to 7 x 10(8)) of spin polarized electrons generated by polarization modulated optical radiation in GaAs and Ge. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3654229]

Item Type: Journal Article
Publication: Review of Scientific Instruments
Publisher: American Institute of Physics
Additional Information: Copyright of this article belongs to American Institute of Physics.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 07 Dec 2011 06:42
Last Modified: 07 Dec 2011 06:42
URI: http://eprints.iisc.ac.in/id/eprint/42536

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