Lateral length scales in exchange bias

  title={Lateral length scales in exchange bias},
  author={Igor V. Roshchin and Oleg Petracic and R. Morales and Zhi-Pan Li and Xavier Batlle and Ivan K. Schuller},
When a ferromagnet is in proximity to an antiferromagnet, lateral length scales such as the respective magnetic domain sizes drastically affect the exchange bias. Bilayers of FeF2 and either Ni, Co or Fe are studied using SQUID and spatially resolved MOKE. When the antiferromagnetic domains are larger than or comparable to the ferromagnetic domains, a local, non-averaging exchange bias is observed. This gives rise to unusual and tunable magnetic hysteresis curves. 

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Handbook of Magnetic Materials, edited by Buschow K
  • H. J.,
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