Low Ghz loss in sputtered epitaxial Fe

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We show that sputtered, pure epitaxial iron films can have high-frequency loss as low as, or lower than, any known metallic ferromagnetic heterostructure. Minimum 34 Ghz ferromagnetic resonance (FMR) linewidths of 41 Oe are demonstrated, some ~ 5-10 % lower than the previous minimum reported for molecular beam epitaxially (MBE) deposited Fe. Intrinsic and extrinsic damping have been separated over 0-40 Ghz, giving a lower bound for intrinsic LL(G) relaxation rates of lambda or G = 85 MHz (alpha = 0.0027) and extrinsic 50 Mhz. Swept frequency measurements indicate the potential for integrated frequency domain devices with Q>100 at 30-40 Ghz.

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Materials Science

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http://salesiana.dossiersoluciones.com/handle/123456789/108292

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0602094
 http://arxiv.org/abs/cond-mat/0602094

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arXiv