A microwave absorption study in the ferromagnetoelectric Pb(Fe1-xMx)O-3 (M= Ta, W, Nb) perovskites

作者：Alvarez G^*; Pena J A; Castellanos M A; Montiel H; Zamorano R

来源：Revista Mexicana de Fisica, 2012, 58(2): 24-27.

• Microwave absorption
• electron paramagnetic resonance
• magnetic transitions

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(Fe1/2Ta1/1)O-3 (PFT), Pb(Fe1/2Nb1/2)O-3 (PFN) and Pb(Fe2/3W1/3)O-3 (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.

• 出版日期2012-12