Journal
MATERIALS
Volume 9, Issue 3, Pages -Publisher
MDPI AG
DOI: 10.3390/ma9030169
Keywords
microwave H-field irradiation; manganese spinel oxides; reduction reaction
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Funding
- JSPS KAKENHI [15K141150]
- Grants-in-Aid for Scientific Research [15K14115] Funding Source: KAKEN
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NiMn 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 2+, suggesting that Mn3+ is partially reduced. Moreover, the magnetization of NiMn 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 is controlled by microwave H-field irradiation, resulting in control over the magnetic properties.
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