Ultrafast perturbation of magnetic domains by optical pumping in a ferromagnetic multilayer
Ultrafast optical pumping of spatially nonuniform magnetic textures is known to induce far-from-equilibrium spin transport effects. Here, we use ultrafast x-ray diffraction with unprecedented dynamic range to study the laser-induced dynamics of labyrinth domain networks in ferromagnetic CoFe/Ni mult...
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creator | Zusin, Dmitriy Iacocca, Ezio Loïc Le Guyader Reid, Alexander H Schlotter, William F Tian-Min, Liu Higley, Daniel J Coslovich, Giacomo Wandel, Scott F Tengdin, Phoebe M Patel, Sheena K K Shabalin, Anatoly Nelson, Hua Hrkac, Stjepan B Nembach, Hans T Shaw, Justin M Montoya, Sergio A Blonsky, Adam Gentry, Christian Hoefer, Mark A Murnane, Margaret M Kapteyn, Henry C Fullerton, Eric E Shpyrko, Oleg Dürr, Hermann A Silva, T J |
description | Ultrafast optical pumping of spatially nonuniform magnetic textures is known to induce far-from-equilibrium spin transport effects. Here, we use ultrafast x-ray diffraction with unprecedented dynamic range to study the laser-induced dynamics of labyrinth domain networks in ferromagnetic CoFe/Ni multilayers. We detected azimuthally isotropic, odd order, magnetic diffraction rings up to 5th order. The amplitudes of all three diffraction rings quench to different degrees within 1.6 ps. In addition, all three of the detected diffraction rings both broaden by 15% and radially contract by 6% during the quench process. We are able to rigorously quantify a 31% ultrafast broadening of the domain walls via Fourier analysis of the order-dependent quenching of the three detected diffraction rings. The broadening of the diffraction rings is interpreted as a reduction in the domain coherence length, but the shift in the ring radius, while unambiguous in its occurrence, remains unexplained. In particular, we demonstrate that a radial shift explained by domain wall broadening can be ruled out. With the unprecedented dynamic range of our data, our results provide convincing evidence that labyrinth domain structures are spatially perturbed at ultrafast speeds under far-from-equilibrium conditions, albeit the mechanism inducing the perturbations remains yet to be clarified. |
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Here, we use ultrafast x-ray diffraction with unprecedented dynamic range to study the laser-induced dynamics of labyrinth domain networks in ferromagnetic CoFe/Ni multilayers. We detected azimuthally isotropic, odd order, magnetic diffraction rings up to 5th order. The amplitudes of all three diffraction rings quench to different degrees within 1.6 ps. In addition, all three of the detected diffraction rings both broaden by 15% and radially contract by 6% during the quench process. We are able to rigorously quantify a 31% ultrafast broadening of the domain walls via Fourier analysis of the order-dependent quenching of the three detected diffraction rings. The broadening of the diffraction rings is interpreted as a reduction in the domain coherence length, but the shift in the ring radius, while unambiguous in its occurrence, remains unexplained. In particular, we demonstrate that a radial shift explained by domain wall broadening can be ruled out. With the unprecedented dynamic range of our data, our results provide convincing evidence that labyrinth domain structures are spatially perturbed at ultrafast speeds under far-from-equilibrium conditions, albeit the mechanism inducing the perturbations remains yet to be clarified.</description><identifier>EISSN: 2331-8422</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Dilation ; Domain walls ; Ferromagnetism ; Inelastic scattering ; Magnetic domains ; Magnons ; Momentum ; Multilayers ; Optical pumping</subject><ispartof>arXiv.org, 2022-06</ispartof><rights>2022. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). 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Here, we use ultrafast x-ray diffraction with unprecedented dynamic range to study the laser-induced dynamics of labyrinth domain networks in ferromagnetic CoFe/Ni multilayers. We detected azimuthally isotropic, odd order, magnetic diffraction rings up to 5th order. The amplitudes of all three diffraction rings quench to different degrees within 1.6 ps. In addition, all three of the detected diffraction rings both broaden by 15% and radially contract by 6% during the quench process. We are able to rigorously quantify a 31% ultrafast broadening of the domain walls via Fourier analysis of the order-dependent quenching of the three detected diffraction rings. The broadening of the diffraction rings is interpreted as a reduction in the domain coherence length, but the shift in the ring radius, while unambiguous in its occurrence, remains unexplained. In particular, we demonstrate that a radial shift explained by domain wall broadening can be ruled out. With the unprecedented dynamic range of our data, our results provide convincing evidence that labyrinth domain structures are spatially perturbed at ultrafast speeds under far-from-equilibrium conditions, albeit the mechanism inducing the perturbations remains yet to be clarified.</description><subject>Dilation</subject><subject>Domain walls</subject><subject>Ferromagnetism</subject><subject>Inelastic scattering</subject><subject>Magnetic domains</subject><subject>Magnons</subject><subject>Momentum</subject><subject>Multilayers</subject><subject>Optical pumping</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNqNirsKwjAUQIMgWLT_cMG5kCbWdhfFD9DJodxqUlLyMo-hf28HcXY6cM5ZkYJxXlfdgbENKWOcKKXs2LKm4QV53HUKKDEm8CKkHAZMyllwEgyOViT1hJczqGyEYQbnF4EafDZe2RGUBQQpQnC_22SdlMZZhB1ZS9RRlF9uyf5yvp2ulQ_unUVM_eRysEvqGW9o3dWs5fy_6wMK50QK</recordid><startdate>20220609</startdate><enddate>20220609</enddate><creator>Zusin, Dmitriy</creator><creator>Iacocca, Ezio</creator><creator>Loïc Le Guyader</creator><creator>Reid, Alexander H</creator><creator>Schlotter, William F</creator><creator>Tian-Min, Liu</creator><creator>Higley, Daniel J</creator><creator>Coslovich, Giacomo</creator><creator>Wandel, Scott F</creator><creator>Tengdin, Phoebe M</creator><creator>Patel, Sheena K K</creator><creator>Shabalin, Anatoly</creator><creator>Nelson, Hua</creator><creator>Hrkac, Stjepan B</creator><creator>Nembach, Hans T</creator><creator>Shaw, Justin M</creator><creator>Montoya, Sergio A</creator><creator>Blonsky, Adam</creator><creator>Gentry, Christian</creator><creator>Hoefer, Mark A</creator><creator>Murnane, Margaret M</creator><creator>Kapteyn, Henry C</creator><creator>Fullerton, Eric E</creator><creator>Shpyrko, Oleg</creator><creator>Dürr, Hermann A</creator><creator>Silva, T J</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope></search><sort><creationdate>20220609</creationdate><title>Ultrafast perturbation of magnetic domains by optical pumping in a ferromagnetic multilayer</title><author>Zusin, Dmitriy ; 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Here, we use ultrafast x-ray diffraction with unprecedented dynamic range to study the laser-induced dynamics of labyrinth domain networks in ferromagnetic CoFe/Ni multilayers. We detected azimuthally isotropic, odd order, magnetic diffraction rings up to 5th order. The amplitudes of all three diffraction rings quench to different degrees within 1.6 ps. In addition, all three of the detected diffraction rings both broaden by 15% and radially contract by 6% during the quench process. We are able to rigorously quantify a 31% ultrafast broadening of the domain walls via Fourier analysis of the order-dependent quenching of the three detected diffraction rings. The broadening of the diffraction rings is interpreted as a reduction in the domain coherence length, but the shift in the ring radius, while unambiguous in its occurrence, remains unexplained. In particular, we demonstrate that a radial shift explained by domain wall broadening can be ruled out. With the unprecedented dynamic range of our data, our results provide convincing evidence that labyrinth domain structures are spatially perturbed at ultrafast speeds under far-from-equilibrium conditions, albeit the mechanism inducing the perturbations remains yet to be clarified.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><oa>free_for_read</oa></addata></record> |
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subjects | Dilation Domain walls Ferromagnetism Inelastic scattering Magnetic domains Magnons Momentum Multilayers Optical pumping |
title | Ultrafast perturbation of magnetic domains by optical pumping in a ferromagnetic multilayer |
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