Control of magnetic properties of NiMn2O4 by a microwave magnetic field under air

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NiMn2O4 prepared by conventional heating was irradiated with a microwave H-field using a single-mode cavity under air and magnetic properties of the microwave-irradiated material were investigated. X-ray diffraction and transmission electron microscopy demonstrated that the phase and microstructure are not affected by H-field irradiation. Measurements of the magnetization as a function of temperature revealed that the antiferromagnetic sublattice disappeared and electron spin resonance showed the existence of Mn2+, suggesting that Mn3+ is partially reduced. Moreover, the magnetization of NiMn2O4 was controlled from 35.3 to 18.2 emu/g and the coercivity from 140 to 750 Oe by changing the sample temperature during microwave irradiation. The reduction reaction of NiMn2O4 is controlled by microwave H-field irradiation, resulting in control over the magnetic properties.

Original languageEnglish
Article number169
Issue number3
Publication statusPublished - 2016 Mar 1


  • Manganese spinel oxides
  • Microwave H-field irradiation
  • Reduction rea


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