Direct-current effects on magnetization reversal properties of submicron-size Permalloy patterns for radio-frequency devices

Hanqiao Zhang; Hoffmann, Axel; Divan, Ralu; Pingshan Wang
December 2009
Applied Physics Letters;12/7/2009, Vol. 95 Issue 23, p232503
Academic Journal
Ferromagnetic resonance (FMR) spectroscopy is used to measure direct-current (dc) effects on the magnetization reversal properties of submicron-sized lateral patterned magnetic material. The observed FMR frequency-field relationship shows that for both 240 and 550 nm wide Permalloy (Py) nanowires the coercivity is reduced by ∼33% when a 50 mA dc passes through the transmission line where the nanowires are incorporated. The temperature dependence of the coercivity has a T relationship which suggests the coherent rotation mode tendency in such 100 nm thick Py nanowires.


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