Journal of the Korean Magnetics Society (한국자기학회지)

The Korean Magnetics Society (한국자기학회)
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Study on Magnetization Reversal Behavior in Ferromagnetic Co0.5Fe0.5 Alloy Films

강자성 Co0.5Fe0.5 합금 박막에서의 자화역전현상 연구

  • Ryu, Kwang-Su (Department of Physics Education, Korea National University of Education)
  • 류광수 (한국교원대 물리교육과)
  • Received : 2015.11.20
  • Accepted : 2015.12.15
  • Published : 2015.12.31
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Abstract

We have investigated the magnetization reversal behavior in ferromagnetic $Co_{0.5}Fe_{0.5}$ alloy films using the magneto-optical Kerr microscope capable of the direct observation of time-resolved domain patterns. Interestingly enough, as the sample thickness increases the magnetization reversal behavior becomes changed from a single domain wall motion to the random nucleations of domains. Also, from the stochastic analysis of the domain jump sizes during the domain wall motion, it was found that the magnetization reversal behavior in the samples shows the critical scaling behavior with the critical exponent of ${\tau}{\sim}1.33$.

실시간 자구 관찰이 가능한 광자기 현미경을 이용하여 강자성 나노자성체 CoFe 박막에서의 자화역전현상을 연구하였다. 흥미롭게도, 박막의 두께가 증가함에 따라 자구벽의 운동이 단일 자구벽의 운동 성향에서 무작위적인 자구들의 역전 성향으로 변함을 알 수 있었다. 또한, 자구벽 운동에서의 자구들의 점프사이즈들의 통계적인 해석 결과, CoFe박막에서의 자구역전현상이 임계지수 ${\tau}{\sim}1.33$를 가지는 임계축척현상을 보임을 알 수 있었다.

Keywords

References

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