Ultrafast time-evolution of chiral Néel magnetic domain walls probed by circular dichroism in x-ray resonant magnetic scattering.
Ultrafast time-evolution of chiral Néel magnetic domain walls probed by circular dichroism in x-ray resonant magnetic scattering.
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DOI：
10.1038/s41467-022-28899-0
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发表时间：
2022-03-17
影响因子：
16.6
通讯作者：
Jaouen N
中科院分区：
文献类型：
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作者：
Léveillé C;Burgos-Parra E;Sassi Y;Ajejas F;Chardonnet V;Pedersoli E;Capotondi F;De Ninno G;Maccherozzi F;Dhesi S;Burn DM;van der Laan G;Latcham OS;Shytov AV;Kruglyak VV;Jal E;Cros V;Chauleau JY;Reyren N;Viret M;Jaouen N
铁磁薄膜中的非共线自旋织构正吸引着新的兴趣，这是由于几种磁相互作用的可能的精细工程，特别是界面Dzyaloshinskiii-Moriya相互作用。这允许稳定复杂的手性自旋纹理，例如手性磁畴壁（DW）、自旋螺旋和磁性skyrmion等。本文报道了垂直磁化非对称多层膜中手征波在光抽运后的超短时间尺度上的行为。利用时间分辨圆二色性在X射线共振磁散射（CD-XRMS）的磁化动力学探测。我们观察到的CD-XRMS，这是由于自旋电流引起的连续变化的自旋纹理的DW内的相干和非相干扭矩的皮秒瞬态减少。我们认为，一个特定的退磁的DW的内部结构诱导从邻近的磁畴内部的自旋流。我们确定这种随时间变化的DW纹理的激光脉冲后不久，作为一个失真的同手性Néel形状朝着瞬态混合布洛赫-Néel-布洛赫纹理沿着横向DW的方向。在磁系统中存在的复杂自旋结构（例如畴壁）中的信息编码是有兴趣的。在这里，Léveillé等人研究了手征畴壁的超快动力学，并显示了畴壁处瞬时自旋手征织构的出现。
Non-collinear spin textures in ferromagnetic ultrathin films are attracting a renewed interest fueled by possible fine engineering of several magnetic interactions, notably the interfacial Dzyaloshinskii-Moriya interaction. This allows for the stabilization of complex chiral spin textures such as chiral magnetic domain walls (DWs), spin spirals, and magnetic skyrmions among others. We report here on the behavior of chiral DWs at ultrashort timescale after optical pumping in perpendicularly magnetized asymmetric multilayers. The magnetization dynamics is probed using time-resolved circular dichroism in x-ray resonant magnetic scattering (CD-XRMS). We observe a picosecond transient reduction of the CD-XRMS, which is attributed to the spin current-induced coherent and incoherent torques within the continuously varying spin texture of the DWs. We argue that a specific demagnetization of the inner structure of the DW induces a flow of spins from the interior of the neighboring magnetic domains. We identify this time-varying change of the DW texture shortly after the laser pulse as a distortion of the homochiral Néel shape toward a transient mixed Bloch-Néel-Bloch texture along a direction transverse to the DW. There is interest in encoding of information in complex spin structures present in magnetic systems, such as domain walls. Here, Léveillé et al study the ultrafast dynamics of chiral domain walls, and show the emergence of a transient spin chiral texture at the domain wall.
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影响因子：
8.6
作者：
FERT, A;LEVY, PM
通讯作者：
LEVY, PM
影响因子：
1.6
作者：
Vansteenkiste, Arne;Leliaert, Jonathan;Van Waeyenberge, Bartel
通讯作者：
Van Waeyenberge, Bartel
影响因子：
38.3
作者：
Kampfrath, T.;Battiato, M.;Muenzenberg, M.
通讯作者：
Muenzenberg, M.
影响因子：
4.6
作者：
Vodungbo B;Tudu B;Perron J;Delaunay R;Müller L;Berntsen MH;Grübel G;Malinowski G;Weier C;Gautier J;Lambert G;Zeitoun P;Gutt C;Jal E;Reid AH;Granitzka PW;Jaouen N;Dakovski GL;Moeller S;Minitti MP;Mitra A;Carron S;Pfau B;von Korff Schmising C;Schneider M;Eisebitt S;Lüning J
通讯作者：
Lüning J
影响因子：
16.6
作者：
通讯作者：
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