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Fine metal particles having super high coercivity

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4 Author(s)
Watanabe, A. ; TDK Electronics Company Ltd., Nagano, Japan ; Uehori, T. ; Saitoh, S. ; Imaoko, Y.

Fine iron-cobalt particles with coercivities as high as 2200 Oe have been obtained. The particles were precipitated from an aqueous solution using sodium borohydride. The coercivity was studied as a function of composition with the maximum coercivity found at 65:35 (Fe:Co ratio). The coercivity was found to arise from two effects. The first is shape anisotropy due to the chain of spheres structure of the particles. The second is a high magnetic surface anisotropy. No evidence of a contribution from magnetocrystalline anisotropy was found.

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Magnetics, IEEE Transactions on  (Volume:17 ,  Issue: 4 )