Advanced control of gigantic spin waves induced in ferrimagnetic thin films

Research Project

Project/Area Number	26790076
Research Category	Grant-in-Aid for Young Scientists (B)
Allocation Type	Multi-year Fund
Research Field	Quantum beam science
Research Institution	Japan Synchrotron Radiation Research Institute
Principal Investigator	Ohkochi Takuo 公益財団法人高輝度光科学研究センター, 利用研究促進部門, 研究員 (00435596)
Project Period (FY)	2014-04-01 – 2016-03-31
Project Status	Completed (Fiscal Year 2015)
Budget Amount *help	¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000) Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000) Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords	フェリ磁性 / スピン波 / 光電子顕微鏡 / 時間分解 / フェムト秒レーザー / パルスレーザー / マイクロ波励起 / フェリ磁性薄膜 / 光誘起磁気制御 / マイクロ波共鳴
Outline of Final Research Achievements	It have been widely known that "magnetic-field-free" ultrafast magnetization reversals are realized by applying femtosecond laser pulses to ferrimagnetic GdFeCo thin films. The applicant had so far showed that remarkably giant magnetic waves can also be induced by applying similar method in certain situations. In this project, the applicant had made progress in theoretical and experimental elucidation of the mechanism of this giant spin wave phenomenon, as well as in instrumental upgrading such as stabilized laser beams and experiment system under microwave excitations for advanced control of the spin waves. General properties and findings on light-induced spin manipulations for ferrimagnets have been obtained in the experiments.