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Origin of Ferromagnetism in Cd1−xMnxO Nanoparticles

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Abstract

The origin of ferromagnetism in nanoparticles of polycrystalline Cd1−xMnxO (x = 0, 2%, 10%) prepared using co-precipitation method is presented. The XPS studies indicate the presence of oxygen vacancies along with mixed oxidation states of manganese (Mn4+ and Mn2+) and cadmium (Cd2+, Cd4+). The room temperature isothermal hysteresis measurements show that upon Mn doping, there is enhancement in ferromagnetic ordering and in coercivity of CdO nanoparticles. The zero-field-cooled and field-cooled magnetization as function of temperature indicates the presence of disordered magnetic structure, which may be due to the formation of bound magnetic polarons by mixed valance states of Mn cations and oxygen vacancies. The enhancement in dielectric constant with Mn substitution also points to the enhancement of space charge polarization and the frequency-dependent ac-conductivity indicates the small polarons hoping mechanism of conductivity.

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Authors and Affiliations

  1. Department of Physics and Photonics Science, NIT Hamirpur (HP), Hamirpur, 177005, India

    Leelavati & Rajesh Kumar

  2. Department of Material Science and Engineering, NIT Hamirpur (HP), Hamirpur, 177005, India

    Ravi Kumar

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  1. Leelavati
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  2. Rajesh Kumar
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Leelavati, Kumar, R. & Kumar, R. Origin of Ferromagnetism in Cd1−xMnxO Nanoparticles. J Supercond Nov Magn 35, 2851–2858 (2022). https://doi.org/10.1007/s10948-022-06324-3

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