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KAKEN_26249052seika.pdf
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| Title |
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膜厚方向スピン波の実空間観察とスピン波アシスト磁化反転の動的過程解明
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マクアツ ホウコウ スピンハ ノ ジツクウカン カンサツ ト スピンハ アシスト ジカ ハンテン ノ ドウテキ カテイ カイメイ
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Makuatsu hoko supinha no jitsukukan kansatsu to supinha ashisuto jika hanten no doteki katei kaimei
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Research on dynamical process of spinwave-assisted magnetization reversal and observation of spinwaves excited along thickness direction
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能崎, 幸雄
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ノザキ, ユキオ
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Nozaki, Yukio
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慶應義塾大学・理工学部・教授
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Research team head
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科研費研究者番号 : 30304760
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渡邉, 紳一
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ワタナベ, シンイチ
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Watanabe, Shinichi
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慶應義塾大学・理工学部・准教授
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Research team member
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科研費研究者番号 : 10376535
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2017
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科学研究費補助金研究成果報告書
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2016
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| Abstract |
膜厚方向で磁気特性を変調させたECC媒体に励起されるスピン波の磁化反転アシスト効果を調べるため, 磁化ダイナミクスを面内, および膜厚方向で空間分解可能なマイクロMOKE計測システムを開発した。また, 極短パルス磁場をプローブ信号とするCooperative switching法を開発し, ナノスケール磁性体の非平衡状態の非線形磁化ダイナミクスの時間分解観察に成功した。さらに, ECC媒体の臨界スイッチング周波数の層間交換結合力依存性を測定した結果, 16nm厚の極薄媒体でも膜厚方向のスピン波が磁化反転をアシスト可能なことを実験的に確かめた。
In order to study a magnetization switching assisted by a spin waves along a thickness direction of an exchange coupled composite (ECC) medium, we developed a micro-MOKE measurement system which enables to spatially resolve the magnetization dynamics. In addition, we succeeded to demonstrate a temporarily resolved observation of nonlinear magnetization dynamics in nonequilibrium state of nano-scaled ferromagnet. From the dependence of a critical switching frequency of an ECC medium on the strength of interlayer exchange coupling, we experimentally confirmed that the spin wave assisted magnetization reversal could be realized even in ultra-thin ECC media with a thickness of 16 nm.
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研究種目 : 基盤研究(A)(一般)
研究期間 : 2014～2016
課題番号 : 26249052
研究分野 : 磁性物理学
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