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arXiv 1406.7334cond-mat.mtrl-sci
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BaFe12O19 M型六角铁氧体中的自旋-声子耦合

Spin-phonon coupling in BaFe12O19 M-type hexaferrite

Flávio M. Silva Júnior, Carlos W. A. Paschoal

摘要:

磁性材料中的自旋-声子耦合是由于晶格振动对交换积分的调制。BaFe_(12)O_(19)M型六角铁氧体是最常用的永磁体磁性材料,在高温下转变为铁磁体,但在此转变过程中没有观察到自旋-声子耦合。在这封信中,我们研究了多晶BaFe 12 O 19 M型六角铁氧体从室温到780 K的温度依赖的拉曼光谱,以探测亚铁磁转变处的自旋-声子耦合。在BaM中观察到Fe(4)O 6八面体的声子位置异常,证明在720 K的亚铁磁转变中存在自旋-声子耦合.结果还证实了即使在自旋组态相同的情况下,每个声子的自旋-声子耦合也是不同的。

英文摘要:

The spin-phonon coupling in magnetic materials is due to the modulation of the exchange integral by lattice vibrations. BaFe12O19 M-type hexaferrite, which is the most used magnetic material as permanent magnet, transforms into ferromagnet at high temperatures, but no spin-phonon coupling was previously observed at this transition. In this letter, we investigated the temperature-dependent Raman spectra of polycrystalline BaFe12O19 M-type hexaferrite from room temperature up to 780 K to probe spin-phonon coupling at the ferrimagnetic transition. An anomaly was observed in the position of the phonon attributed to the Fe(4)O6 octahedra, evidencing the presence of a spin-phonon coupling in BaM in the ferrimagnetic transition at 720 K. The results also confirmed the spin-phonon coupling is different for each phonon even when they couple with the same spin configuration.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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