Magnetic Aftereffect and Magnetization Reversal of Sr-Ferrite Fine Particles

IEEE Translation Journal on Magnetics in Japan Pub Date : 1994-09-01 DOI:10.1109/TJMJ.1994.4565938

H. Nishio;H. Taguchi;F. Hirata;T. Takeishi

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引用次数: 2

Abstract

the magnetic aftereffect constant (S _v ), the anisotropy field (H _A ) distribution and the rotational hysteresis integral (R _h ) were measured for M-type hexagonal strontium ferrite (SrM) fine particles with various average particle diameters (D) and coercive forces (H _cJ ). The relations between S _v , the activation volume (v), H _cJ , H _A , and R _h were studied, as well as the effect of milling. S _v is constant and independent of the magnetic field. In S _v varies in proportion to In H _cJ , and the relation H _cJ ∝v ^-2 was found to obtain in SrM particles not extensively subjected to milling. S _v increases and v decreases for SrM fine particles (D=0.3 μm) whose H _A is widely distributed by milling, even though H _cJ decreases markedly. S _v and v are related to the distribution of H _A . As H _cJ increases, R _h and v decrease, which indicates that the magnetization reversal mechanism of SrM fine particles approaches that of a coherent rotation mode.

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锶铁氧体细颗粒的磁后效应和磁化反转

测量了具有不同平均粒径（D）和矫顽力（HcJ）的M型六方锶铁氧体（SrM）细颗粒的磁后效常数（Sv）、各向异性场（HA）分布和旋转磁滞积分（Rh）。研究了Sv、活化体积（v）、HcJ、HA和Rh之间的关系，以及研磨的影响。Sv是恒定的并且与磁场无关。In Sv与In HcJ成比例变化，发现在未广泛进行研磨的SrM颗粒中获得HcJřv-2关系。对于HA通过研磨而广泛分布的SrM细颗粒（D=0.3μm），尽管HcJ显著降低，但Sv增加，v降低。Sv和v与HA的分布有关。随着HcJ的增加，Rh和v减小，这表明SrM细颗粒的磁化反转机制接近相干旋转模式。

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IEEE Translation Journal on Magnetics in Japan

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