Low-temperature magnetization dymanics of TM-Al-O (TM=Fe and Co) granular magnetic films

TM-Al-O（TM=Fe和Co）颗粒磁性薄膜的低温磁化动力学

• 批准号: 23560027
• 负责人: YOSHIHARA Akira
• 金额: $ 3.41万
• 依托单位: Ishinomaki Senshu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23560027/
• 关键词: 磁性薄膜材料; レーザー分光学; ブリルアン散乱; 磁化動力学; 低温; 光散乱; 超常磁性; Co-Al-O膜; 低温測定; スピン波; 交換相互作用; 磁気異方性; 保持力; 超常磁性磁気散乱; Co-Al-O; Fe-Al-O; Co-Aｌ-O; 強磁性

We prepared a closed-cycle refrigerator for low-temperature Brillouin light scattering (BLS) study under external magnetic fields. We also improved the performances of our BLS apparutus for long spectrum-accumulation. With these apparutus we successfully observed scattering from super-paramagnetic (SPM) excitations for Co-Al-O films in a temparture range of between 300K and 15K under magetic fields of between 2.0kOe and 4.5 kOe.We developed a theoretical model for SPM BLS spectrum. We could analyze the observed spectra with the theoretical model. We found an anomalous temperature behavior of the peak frequency and width at around 150 K. This anomalous behavior can be attributed to a dispersion effect due to a coupling between precession of particle magnetization and relaxation with a low activation energy and a fast relaxation time of an order of 10 ps.We are planning extensive BLS studies of spin waves from ferromagentic thin films at low temperatures under magnetic fields.

我们在外部磁场下准备了一个用于低温布里雷因光散射（BLS）研究的闭合循环冰箱。我们还改善了BLS Aptautus的性能，以进行长频谱 - 蓄能。使用这些表情，我们成功地观察到了从超级磁磁（SPM）激发共同胶片的散射，在2.0koe和4.5 Koe之间的频段范围为300k至15k之间，在300k至15k之间的散射。我们可以通过理论模型分析观察到的光谱。 We found an anomalous temperature behavior of the peak frequency and width at around 150 K. This anomalous behavior can be attributed to a dispersion effect due to a coupling between precession of particle magnetization and relaxation with a low activation energy and a fast relaxation time of an order of 10 ps.We are planning extensive BLS studies of spin waves from ferromagentic thin films at low temperatures under magnetic fields.

项目成果

超常磁性Co-Al-Oグラニュラー膜の磁気励起ブリルアン散乱

超顺磁Co-Al-O颗粒薄膜的磁激发布里渊散射

• 发表时间: 2011
• 作者: 矢木 康太;加賀 充;山下 浩司;竹田 健一郎;岩谷 素顕;竹内 哲也;上山 智;赤崎 勇;天野 浩;吉原章,中村慎太郎,大沼繁弘,野島勉
• 通讯作者: 吉原章,中村慎太郎,大沼繁弘,野島勉

強磁性TM-Al-O (TM=Fe, Co)グラニュラー膜の保持力の温度変化

铁磁TM-Al-O(TM=Fe,Co)颗粒薄膜矫顽力的温度变化

• 发表时间: 2013
• 作者: 町田真悟，井上大輔，筏有加，谷口淳子，鈴木勝，石川誠，三浦浩治;中村慎太郎,吉原章,大沼繁弘,野島勉
• 通讯作者: 中村慎太郎,吉原章,大沼繁弘,野島勉

Transport and magnetic properties of ferro- magnetic Co-Al-O and Fe-Al-O granular films

铁磁性 Co-Al-O 和 Fe-Al-O 颗粒薄膜的输运和磁性能

• 发表时间: 2011
• 期刊: J. Phys. Condensed Matter : Conference Series
• 作者: S. Nakamura;T. Iwashita;T. Nojima;A. Yoshihara;S. Ohnuma and H. Fujimori
• 通讯作者: S. Ohnuma and H. Fujimori

強磁性Co-Al-Oグラニュラー膜の低温磁化と交換バイアス

铁磁Co-Al-O颗粒薄膜的低温磁化和交换偏置

• 发表时间: 2013
• 作者: T. Kawauchi;K. Fukutani;M. Matsumoto;K. Oda;T. Okano;X.-W. Zhang;Y. Yoda;堀田訓宏,奥平幸司,間瀬一彦,西龍彦,上野信雄;筏有加，井上大輔，町田真悟，谷口淳子，鈴木勝，石川誠，三浦浩治，;中村慎太郎,吉原章,大沼繁弘,野島勉
• 通讯作者: 中村慎太郎,吉原章,大沼繁弘,野島勉

強磁性TM-Aｌ-O (TM=Fe, Co) グラニュラー膜の保持力の温度変化

铁磁TM-Al-O(TM=Fe,Co)颗粒薄膜矫顽力的温度变化

• 发表时间: 2013
• 作者: 鈴木康史,沖村邦雄;武安光太郎,松本益明,福谷克之;中村慎太郎，吉原 章，大沼繁弘，野島 勉
• 通讯作者: 中村慎太郎，吉原 章，大沼繁弘，野島 勉