超常磁性の解析 : 磁化曲線とブロッキング温度

概要

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Analyses of superparamagnetism are reexamined. Questions are raised concerning conventional analyses of the observed behavior of well-isolated iron-nitride nanoparticles with a narrow size distribution. It is shown that analysis of magnetization curves based on the Langevin function gives spurious information on the distribution of magnetic moments below temperatures several times as high as the blocking temperature. As regards magnetic relaxations, we obtain a spurious result if the blocking temperature in a finite field is estimated by using the temperature T_max, at which the susceptibility shows a maximum. It is shown that the analysis using T_max is not suitable for discussing relaxations in detail, because T_max is affected by the variation of static behavior.
社団法人日本磁気学会の論文
2003-02-01