Study and tailoring spin dynamic properties of CoFeB during rapid thermal annealing

We studied the real-time evolution of magnetic dynamic and static properties of 20 nm CoFeB thin film during annealing at 380 °C. The ferromagnetic resonance linewidth quickly reduces by 30% within 300 s annealing, and monotonically increases upon longer annealing. The magnetic static coercivity sho...

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Veröffentlicht in:Applied physics letters 2011-01, Vol.98 (4)
Hauptverfasser: Zhang, Yaping, Fan, Xin, Wang, Weigang, Kou, Xiaoming, Cao, Rong, Chen, Xing, Ni, Chaoying, Pan, Liqing, Xiao, John Q.
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Sprache:eng
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Zusammenfassung:We studied the real-time evolution of magnetic dynamic and static properties of 20 nm CoFeB thin film during annealing at 380 °C. The ferromagnetic resonance linewidth quickly reduces by 30% within 300 s annealing, and monotonically increases upon longer annealing. The magnetic static coercivity shows similar trend. The underlying physical relation between linewidth and anisotropy can be connected by the two-magnon scattering theory. By doping of Nb into CoFeB films, the damping was maintained at a low value within 2000 s annealing. This method to tailor the dynamic properties of CoFeB may benefit the development of magnetics and spintronics based microwave devices.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3549188