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首页> 外文期刊>IEEE Transactions on Magnetics >AF-Biased CoFe Multilayer Films With FMR Frequency at 5 GHz and Beyond
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AF-Biased CoFe Multilayer Films With FMR Frequency at 5 GHz and Beyond

机译：AF-Biased CoFe Multilayer Films With FMR Frequency at 5 GHz and Beyond

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摘要

Antiferromagnetic/ferromagnetic/antiferromagnetic (AF/F/AF) multilayers are investigated. The AF layer is 500-A-thick Ni_(50)Mn_(50). Films are studied as a function of the thickness of the ferromagnetic layer (e_(F)). Films with Ni_(80)Fe_(20), Co_(50)Fe_(50), and Co_(90)Fe_(10) exhibit interfacial exchange coupling energy densities (J_(ex)) of 0.22, 0.82, and 0.97 erg.cm~(-2) respectively. High J_(ex) ensures strong exchange coupling (H_(ex)) and large uniaxial anisotropy fields (H_(ua)) at 90° from the pinning direction. This promotes soft magnetism in CoFe films while they are not soft naturally. With e_(F)=150 A, H_(ua) is of 570 and 755 Oe for Co_(50)Fe_(50) and Co_(90)Fe_(10). respectively. Thicknesses of ～0.3 μm are also shown possible for practical use by means of multiple alternations (n≥20). Microwave characterizations confirm coherent reversible magnetization processes. Co_(50)Fe_(50) multilayers are the best candidates with the highest μ′ and the lowest μ″ at high frequency because an exceptional combination of a high 4πM_(s) of 21 kG and a small damping factor of 0.015. ferromagnetic resonance frequencies of ～5 GHz are reported, and values of ～10 GHz are shown realistic, for the first time.

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