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Effect of Li-Ferrite on the Temperature Sensitivity of Polycrystalline Li-Zn-Cu Ferrite

2008; Volume: 32; Issue: 5 Linguagem: Inglês

10.3379/msjmag.32.499

2432-0250

Masayuki Naoe, T. Omura, Masatsugu Oishi, Shinya Okazaki, T. Sato, K. Yamasawa, Yoshinao Miura,

Magnetic Properties and Applications

Mn-substituted Li-Zn-Cu ferrite polycrystal is known to be a high-frequency ferrite. The authors recently clarified that this ferrite exhibits strong temperature-dependent magnetic properties. To our knowledge, detailed information on the temperature dependence of this new temperature-sensitive ferrite has not been reported. In the present study, several polycrystalline ferrites were fabricated while controlling the Li-ferrite content to investigate the chemical composition dependence of the temperature characteristics of their magnetic properties. As a result, it was clarified that the strong temperature sensitivity of the Li-Zn-Cu ferrite depended on the large temperature coefficient of the anisotropy constant of Li-ferrite. In addition, the smaller Li-ferrite content intensified the temperature dependence of the apparent anisotropy field, hence reinforcing the temperature-dependent magnetic properties.