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首页> 外文期刊>IEEE Transactions on Magnetics >Magnetically Induced Enhanced Exchange Spring Effect in CoFe_2O_4/CoFe_2/CoFe_2O_4 Films
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Magnetically Induced Enhanced Exchange Spring Effect in CoFe_2O_4/CoFe_2/CoFe_2O_4 Films

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摘要

Earlier, we reported exchange coupling between bilayers of CoFe_2O_4/CoFe_2, where CoFe_2O_4 and CoFe_2 are the hard and soft magnetic layers, respectively. These results suggested trilayers structures of CoFe_2O_4/CoFe_2/CoFe_2O_4 are strong candidates for low hysteresis loss "exchange spring materials." To study this possibility, we extended our investigation to the synthesis of CoFe_2O_4/CoFe_2/CoFe_2O_4 trilayers under different sputtering deposition conditions, which included oxygen pressure in the case of the CoFe_2O_4 component and the application of a magnetic field during the deposition of the soft CoFe_2. The most significant finding was an increase in the exchange spring figure of merit (FoM) of 36 in-plane and 60 out-of-plane by the application of an applied field during the deposition of the soft CoFe_2, resulting in a decrease in hysteretic losses by a similar percentage. We will discuss these spin spring results in terms of an increase in uniaxial anisotropy energy in the CoFe_2 layers due to short-range ordering of Fe-Fe and Co-Co pairs during deposition and an enhancement in the coercivity and remnant magnetization of CoFe_2O_4. We also discuss a metric (FoM) for describing enhancements due to multiple optimized deposition conditions.

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