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http://dx.doi.org/10.4283/JKMS.2011.21.1.010

Thermal Annealing Effect on Ferromagnetic Resonance Properties in CoFeB/MgO Thin Film  

Yoon, Seok-Soo (Department of Physics, Andong National University)
Kim, Dong-Young (Department of Physics, Andong National University)
Publication Information
Journal of the Korean Magnetics Society / v.21, no.1, 2011 , pp. 10-14 More about this Journal
Abstract
We have measured the ferromagnetic resonance (FMR) signal in as deposited and $400^{\circ}C$ annealed CoFeB/MgO thin film to investigate the annealing effect on magnetic anisotropies and FMR linewidth (${\Delta}H_{PP}$). The uniaxial anisotropy field ($H_{K1}$) was only observed in the as deposited sample. Whereas, in the $400^{\circ}C$ annealed sample, the biaxial anisotropy field ($H_{K2}$) was additionally observed in accompany with uniaxial anisotropy field ($H_{K1}$). The appearance of biaxial anisotropy fields was originated from the crystalline growth of bcc CoFeB(001) from the MgO(001) interface and by the B diffusion during thermal annealing. Also, the ${\Delta}H_{PP}$ of $400^{\circ}C$ annealed sample was increased compared with that of as deposited sample, which was due to the broad distribution of the magnetization axis by the biaxial anisotropy.
Keywords
ferromagnetic resonance; uniaxial anisotropy; biaxial anisotropy; FMR linewidth;
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