Ultrafast perturbation of magnetic domains by optical pumping in a ferromagnetic multilayer

Zusin, Dmitriy; Iacocca, Ezio; Le Guyader, Loïc; Reid, Alexander H.; Schlotter, William F.; Liu, Tian-Min; Higley, Daniel J.; Coslovich, Giacomo; Wandel, Scott F.; Tengdin, Phoebe M.; Patel, Sheena K. K.; Shabalin, Anatoly; Hua, Nelson; 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.

doi:10.1103/physrevb.106.144422

Ultrafast perturbation of magnetic domains by optical pumping in a ferromagnetic multilayer

Journal Article · Wed Oct 19 00:00:00 EDT 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.106.144422· OSTI ID:1957641

Zusin, Dmitriy ^[1]; Iacocca, Ezio ^[2]; Le Guyader, Loïc ^[3]; Reid, Alexander H. ^[4]; Schlotter, William F. ^[4]; Liu, Tian-Min ^[4]; Higley, Daniel J. ^[4]; Coslovich, Giacomo ^[4]; Wandel, Scott F. ^[5]; Tengdin, Phoebe M. ^[6]; Patel, Sheena K. K. ^[7]; Shabalin, Anatoly ^[7]; Hua, Nelson ^[7]; Hrkac, Stjepan B. ^[7]; Nembach, Hans T. ^[8]; Shaw, Justin M. ^[8]; Montoya, Sergio A. ^[7]; Blonsky, Adam ^[6]; Gentry, Christian ^[6]; Hoefer, Mark A. ^[6] more »

Univ. of Colorado, Boulder, CO (United States); University of Colorado JILA
Univ. of Colorado, Boulder, CO (United States); Univ. of Colorado, Colorado Springs, CO (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States); European XFEL, Schenefeld (Germany)
SLAC National Accelerator Lab., Menlo Park, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States); MIT Lincoln Lab., Lexington, MA (United States)
Univ. of Colorado, Boulder, CO (United States)
Univ. of California San Diego, La Jolla, CA (United States)
National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
Uppsala Univ. (Sweden)

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 fifth 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. Here, 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.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Colorado, Boulder, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: SC0002002; SC0018237; AC02-76SF00515

OSTI ID:: 1957641

Alternate ID(s):: OSTI ID: 1968469
OSTI ID: 1987319

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 14 Vol. 106; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Ultrafast perturbation of magnetic domains by optical pumping in a ferromagnetic multilayer

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Ultrafast perturbation of magnetic domains by optical pumping in a ferromagnetic multilayer

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