Magnetocapacitance effect of spin tunneling junctions

H. Kaiju, S. Fujita, T. Morozumi, K. Shiiki

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Magnetocapacitance effect of coercive differential spin tunneling junctions Co(100Å)/Al 2O 3(∼20Å)/Co(500Å) fabricated onto a glass substrate by ion-beam mask sputtering was investigated. The impedance was measured by a four-probe method at room temperature in the frequency range from 120 Hz to 1 MHz. It is found that the effective capacitance changes with the application of an external magnetic field. At high frequencies, the magnetocapacitance ratio is as large as the dc magnetoresistance ratio. However, at low frequencies, capacitance changes cannot be observed because the measurement sensitivity is too low. The magnetocapacitance effect was hence found to be a promising tool for high frequency magnetic sensing.

Original languageEnglish
Pages (from-to)7430-7432
Number of pages3
JournalJournal of Applied Physics
Volume91
Issue number10 I
DOIs
Publication statusPublished - 2002 May 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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