Characterizing the Exchange Interaction of Sm-Co/Co (and Fe₆₅Co₃₅) Magnetic Films

Caiyin YOU~(1,2) Zhidong ZHANG~(1+) Xiaokai SUN~1 C.J.Yang~2 Wei LIU~1 Xingguo ZHAO~1 1)Shenyang National Laboratory for Materials Science,Institute of Metal Research and International Centre for Materials Physics,Chinese Academy of Sciences,Shenyang 110016,China 2)Electromagnetic Materials Laboratory,Research Institute of Industrial Science and Technology (RIST),P.O.Box 135,790-330 Pohang,South Korea

摘 要：<正>Exchange interaction plays an important role on magnetic properties of nanocomposite magnets consisting of hard- and soft-magnetic phases.Here the exchange interaction in the Sin-Co/Co (and Fe₆₅Co₃₅) magnetic films was characterized by measuring static （m_r（H）） and demagnetized （m_d（H）） remanence curves.According to conventional method:δm（H）=m_d（H）-[1-2m_r（H）],the exchange interaction was evaluated.The switching fields H′_p and H_p,at which static （m_r（H）） and demagnetized （m_d（H）） remanence show the fastest change,were identified.The relative ratioη=（H_p-H′_p）/H_p of switching fields H′_p and H_p has a linear relationship with the maximum valueδm_max ofδm（H） curves,proposing an alternative way to characterize the exchange interaction.

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