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http://dx.doi.org/10.4283/JKMS.2016.26.6.196

Magnetic Field Dependence of the Activation Volume for Sr-ferrite Particles  

Kim, Hyeon Soo (Department of Physics and Research Institute of Natural Science, Gyeongsang National University)
Jeong, Soon Young (Department of Physics and Research Institute of Natural Science, Gyeongsang National University)
Kim, Kyung Min (Pukyong National University)
Kwon, Hae-Woong (Pukyong National University)
Publication Information
Journal of the Korean Magnetics Society / v.26, no.6, 2016 , pp. 196-200 More about this Journal
Abstract
In this study the mechanisms of magnetization reversal and magnetic interaction effects on activation volumes for Sr-ferrite with different particle sizes are investigated. The activation volumes of C2 sample are larger than those of C3 sample in the range of low magnetic fields. But the fields above the coercivity of sample C2, the activation volumes of both samples are decreased linearly with increasing the applied magnetic field. These phenomena can be explained by the strengths of two critical fields representing the reverse domain nucleation field and the domain wall pinning field as well as the strength of dipolar interaction.
Keywords
Sr-ferrite; activation volume; nucleation field; pinning field; dipolar interaction;
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