A microwave absorption study in the ferromagnetoelectric Pb(Fe1-xMx)O3 (M= Ta,W, Nb) perovskites
We report on the effects of dc magnetic field and temperature on the microwave absorption measurements at X-band (8.8-9.8 GHz), in powder samples of perovskites Pb(Fe1=2Ta1=2)O3 (PFT), Pb(Fe1=2Nb1=2)O3 (PFN) and Pb(Fe2=3W1=3)O3 (PFW). At room temperature (300 K), in all these ferromagnetoelectric ma...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2012 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Redalyc-UNAM |
| OAI Identifier: | oai:redalyc.org:57030392007 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=57030392007 |
| Access Level: | acceso abierto |
| Palabra clave: | Física, Astronomía y Matemáticas Microwave absorption magnetic transitions electron paramagnetic resonance |
| Sumario: | We report on the effects of dc magnetic field and temperature on the microwave absorption measurements at X-band (8.8-9.8 GHz), in powder samples of perovskites Pb(Fe1=2Ta1=2)O3 (PFT), Pb(Fe1=2Nb1=2)O3 (PFN) and Pb(Fe2=3W1=3)O3 (PFW). At room temperature (300 K), in all these ferromagnetoelectric materials, the electron paramagnetic resonance (EPR) spectra show a single broad line associated with Fe3+ ions. For low temperature (77 K), these resonant absorption modes change and they can be associated with: (1) a canting of Fe3+ ion sublattices in the antiferromagnetic matrix and/or (2) a strong magnetic dipolar interaction between Fe2+ and Fe3+ ions. Low-Field Microwave Absorption (LFMA) is used to give further knowledge on these materials, giving an additional support to our analyses. |
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