科研之友
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摘要
Structure and magnetic properties were studied for Sm-Fe-N nanoparticles prepared by surfactant-aid high energy ball milling. Magnetic hardening mechanism of the particles was investigated by evaluating their initial magnetization curves. The particles with average size of 750 nm, 36.5 nm, and 9.4 nm exhibit high coercivity of 12.4, 18.7, and 7.5 kOe, respectively. As particle size decreases, the magnetization process switches from pinning to nucleation behavior, indicating that particle size plays a key role in determining the magnetic hardening mechanism of the nanoparticles.
