Tetragonal Distortion Due to the Jahn–Teller Effect and Coercivity of CuₓCo1–x Fe₂O₄ Synthesized at Various Annealing Temperatures
| Autor: | S. Seino, Yamamoto Takeshi, M. Hisamatsu, Takashi Nakagawa, S. Fujieda |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Annealing (metallurgy) Jahn–Teller effect Crystal structure Coercivity 01 natural sciences Electronic Optical and Magnetic Materials Ion Crystallography Tetragonal crystal system Magnetic anisotropy 0103 physical sciences Crystallite Electrical and Electronic Engineering |
| Zdroj: | IEEE Transactions on Magnetics. 57:1-4 |
| ISSN: | 1941-0069 0018-9464 |
| DOI: | 10.1109/tmag.2020.3013883 |
| Popis: | The crystal structure and magnetic properties of Cu x Co1– x Fe2O4 samples synthesized by a solid-phase reaction method at various annealing temperatures ( ${T}_{\mathrm {a}} =1073$ –1223 K) were investigated. Tetragonal distortion due to the Jahn–Teller effect of Cu2+ ions was observed in the ${x} =0.8$ sample synthesized at ${T} _{\mathrm {a}} =1223$ K. As the magnetic anisotropy constant is enhanced by such distortion, the Cu concentration dependence of the coercivity value ${H} _{\mathrm {c}}$ exhibits a maximum. A decrease in ${T} _{\mathrm {a}}$ caused the enhancement of tetragonal distortion and the reduction of crystallite size. As a result, the largest value of ${H} _{\mathrm {c}} = 2100$ Oe was obtained for the ${x} =0.8$ sample synthesized at ${T} _{\mathrm {a}} =1073$ K. It is clear that the control of both the Cu concentration and annealing temperatures during synthesis is important to obtain large coercivity in Cu x Co1– x Fe2O4. |
| Databáze: | OpenAIRE |
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