Microwave phase detection with a magnetic tunnel junction

A magnetic tunnel junction (MTJ) can detect microwave magnetic field due to the interplay between the ferromagnetic resonance and tunneling magnetoresistance. Based on the fact that the tunneling resistance change is quadratically proportional to the rf magnetic field, we have designed a mixing circ...

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Veröffentlicht in:Applied physics letters 2010-11, Vol.97 (21), p.212501-212501-3
Hauptverfasser: Fan, Xin, Kim, Sangcheol, Kou, Xiaoming, Kolodzey, James, Zhang, Huaiwu, Xiao, John Q.
Format: Artikel
Sprache:eng
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Zusammenfassung:A magnetic tunnel junction (MTJ) can detect microwave magnetic field due to the interplay between the ferromagnetic resonance and tunneling magnetoresistance. Based on the fact that the tunneling resistance change is quadratically proportional to the rf magnetic field, we have designed a mixing circuit in which two microwaves interfere, giving rising to a dc voltage containing the phase difference between the two microwaves. With ability to detect microwave intensity and phase, the MTJ-based device may be used for on-chip microwave network analyzer and spectrum analyzer.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3511328