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In this paper, NiFe 2 O 4 nanoparticles with average grain size of 12 nm were compacted into nanocrystalline materials under the pressure of up to 4.5 GPa. The Mossbauer spectra of NiFe 2 O 4 nanocrystalline at room temperature show that the magnetic interaction and interface atomic state of nanocrystalline were influenced strongly by pressure. Under high pressure,...
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