Control of Magnetic Properties of NiMn(2)O(4) by a Microwave Magnetic Field under Air

NiMn [Formula: see text] O [Formula: see text] 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 Mn [Formula: see text] , suggesting that Mn [Formula: see text] is partially reduced. Moreover, the magnetization of NiMn [Formula: see text] O [Formula: see text] 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 NiMn [Formula: see text] O [Formula: see text] is controlled by microwave H-field irradiation, resulting in control over the magnetic properties.