Dynamics of the Bloch point in an asymmetric permalloy disk

Im, Mi-Young; Han, Hee-Sung; Jung, Min-Seung; Yu, Young-Sang; Lee, Sooseok; Yoon, Seongsoo; Chao, Weilun; Fischer, Peter; Hong, Jung-Il; Lee, Ki-Suk

doi:10.1038/s41467-019-08327-6

Dynamics of the Bloch point in an asymmetric permalloy disk

Journal Article · Tue Feb 05 00:00:00 EST 2019 · Nature Communications

DOI:https://doi.org/10.1038/s41467-019-08327-6· OSTI ID:1542370

Im, Mi-Young ^[1]; Han, Hee-Sung ^[2]; Jung, Min-Seung ^[3]; Yu, Young-Sang ^[4]; Lee, Sooseok ^[2]; Yoon, Seongsoo ^[3]; Chao, Weilun ^[4]; ^[5]; Hong, Jung-Il ^[3]; ^[2]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); DGIST, Daegu (Korea, Republic of); Ulsan National Inst. of Science and Technology (Korea, Republic of)
Ulsan National Inst. of Science and Technology (Korea, Republic of)
DGIST, Daegu (Korea, Republic of)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Santa Cruz, CA (United States)

A Bloch point (BP) is a topological flaw in a ferromagnet at which the local magnetization vanishes. With the difficulty of generating a stable BP in magnetic nanostructures, the intrinsic nature of a BP and its dynamic behaviour has not been verified experimentally. We report a realization of steady-state BPs embedded in deformed magnetic vortex cores in asymmetrically shaped Ni₈₀Fe₂₀ nanodisks. Time-resolved nanoscale magnetic X-ray imaging combined with micromagnetic simulation shows detailed dynamic character of BPs, reflecting rigid and limited lateral movements under magnetic field pulses as well as its crucial role in vortex-core dynamics. Direct visualizations of magnetic structures disclose the unique dynamical feature of a BP as an atomic scale discrete spin texture and allude its influence on the neighbouring spin structures such as magnetic vortices.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: National Research Foundation (NRF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1542370

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 10; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

References (50)

Three-dimensional magnetization structures revealed with X-ray vector nanotomography Donnelly, Claire; Guizar-Sicairos, Manuel; Scagnoli, Valerio Nature, Vol. 547, Issue 7663 https://doi.org/10.1038/nature23006	journal	July 2017
Critical phenomena of emergent magnetic monopoles in a chiral magnet Kanazawa, N.; Nii, Y.; Zhang, X. -X. Nature Communications, Vol. 7, Issue 1 https://doi.org/10.1038/ncomms11622	journal	May 2016
Observation of room-temperature magnetic skyrmions and their current-driven dynamics in ultrathin metallic ferromagnets Woo, Seonghoon; Litzius, Kai; Krüger, Benjamin Nature Materials, Vol. 15, Issue 5 https://doi.org/10.1038/nmat4593	journal	February 2016
The racetrack breaks free from the substrate Fernández-Pacheco, Amalio; Donnelly, Claire Nature Nanotechnology, Vol. 17, Issue 10 https://doi.org/10.1038/s41565-022-01206-0	journal	September 2022
Ground state search, hysteretic behaviour and reversal mechanism of skyrmionic textures in confined helimagnetic nanostructures Beg, Marijan; Carey, Rebecca; Wang, Weiwei Scientific Reports, Vol. 5, Issue 1 https://doi.org/10.1038/srep17137	journal	November 2015
Intrinsic pinning behavior and propagation onset of three-dimensional Bloch-point domain wall in a cylindrical ferromagnetic nanowire Piao, Hong-Guang; Shim, Je-Ho; Djuhana, Dede Applied Physics Letters, Vol. 102, Issue 11 https://doi.org/10.1063/1.4794823	journal	March 2013
Computation of the magnetic domain structure in bulk permalloy Hertel, Riccardo; Kronmüller, Helmut Physical Review B, Vol. 60, Issue 10 https://doi.org/10.1103/physrevb.60.7366	journal	September 1999
Micromagnetic study of Bloch-point-mediated vortex core reversal Thiaville, André; García, José Miguel; Dittrich, Rok Physical Review B, Vol. 67, Issue 9 https://doi.org/10.1103/physrevb.67.094410	journal	March 2003
Dimensionality Crossover in Magnetism: From Domain Walls (2D) to Vortices (1D) Masseboeuf, A.; Fruchart, O.; Toussaint, J. C. Physical Review Letters, Vol. 104, Issue 12 https://doi.org/10.1103/physrevlett.104.127204	journal	March 2010
Exchange Explosions: Magnetization Dynamics during Vortex-Antivortex Annihilation Hertel, Riccardo; Schneider, Claus M. Physical Review Letters, Vol. 97, Issue 17 https://doi.org/10.1103/physrevlett.97.177202	journal	October 2006
Magnetic Domain-Wall Racetrack Memory Parkin, S. S. P.; Hayashi, M.; Thomas, L. Science, Vol. 320, Issue 5873, p. 190-194 https://doi.org/10.1126/science.1145799	journal	April 2008
Unwinding of a Skyrmion Lattice by Magnetic Monopoles Milde, P.; Kohler, D.; Seidel, J. Science, Vol. 340, Issue 6136 https://doi.org/10.1126/science.1234657	journal	May 2013
Magnetic Vortex Core Observation in Circular Dots of Permalloy Shinjo, T. Science, Vol. 289, Issue 5481 https://doi.org/10.1126/science.289.5481.930	journal	August 2000
Bloch Point Structure in a Magnetic Nanosphere Pylypovskyi, Oleksandr V.; Sheka, Denis D.; Gaididei, Yuri arXiv https://doi.org/10.48550/arxiv.1112.2413	text	January 2011
Hedgehog Spin-texture and Berry's Phase tuning in a Magnetic Topological Insulator Xu, Su-Yang; Neupane, Madhab; Liu, Chang arXiv https://doi.org/10.48550/arxiv.1212.3382	text	January 2012
Pinning of a Bloch point by an atomic lattice Kim, Se Kwon; Tchernyshyov, Oleg arXiv https://doi.org/10.48550/arxiv.1301.6452	text	January 2013
The design and verification of Mumax3 Vansteenkiste, Arne; Leliaert, Jonathan; Dvornik, Mykola arXiv https://doi.org/10.48550/arxiv.1406.7635	text	January 2014
New spiral state and skyrmion lattice in 3D model of chiral magnets Rybakov, F. N.; Borisov, A. B.; Blügel, S. arXiv https://doi.org/10.48550/arxiv.1601.05752	text	January 2016
Vortices in thin ferromagnetic films and the skyrmion number Tretiakov, O. A.; Tchernyshyov, O. arXiv https://doi.org/10.48550/arxiv.cond-mat/0611392	text	January 2006
Soft X-Ray Microscopy of Nanomagnetism Fischer, Peter; Kim, Dong-Hyun; Chao, Weilun ChemInform, Vol. 37, Issue 33 https://doi.org/10.1002/chin.200633246	journal	August 2006
Stray-Field-Free and Related Domain Wall Configurations in Thin Magnetic Films (II) Hubert, A. physica status solidi (b), Vol. 38, Issue 2 https://doi.org/10.1002/pssb.19700380221	journal	January 1970
Soft X-ray microscopy of nanomagnetism Fischer, Peter; Kim, Dong-Hyun; Chao, Weilun Materials Today, Vol. 9, Issue 1-2 https://doi.org/10.1016/S1369-7021(05)71335-3	journal	January 2006
Symmetry breaking in the formation of magnetic vortex states in a permalloy nanodisk Im, Mi-Young; Fischer, Peter; Yamada, Keisuke Nature Communications, Vol. 3, Issue 1 https://doi.org/10.1038/ncomms1978	journal	January 2012
Nanoscale switch for vortex polarization mediated by Bloch core formation in magnetic hybrid systems Wohlhüter, Phillip; Bryan, Matthew Thomas; Warnicke, Peter Nature Communications, Vol. 6, Issue 1 https://doi.org/10.1038/ncomms8836	journal	August 2015
Hedgehog spin texture and Berry’s phase tuning in a magnetic topological insulator Xu, Su-Yang; Neupane, Madhab; Liu, Chang Nature Physics, Vol. 8, Issue 8 https://doi.org/10.1038/nphys2351	journal	June 2012
Point Singularities in Micromagnetism Döring, W. Journal of Applied Physics, Vol. 39, Issue 2 https://doi.org/10.1063/1.1656144	journal	February 1968
Micromagnetic simulations of magnetic normal modes in elliptical nanomagnets with a vortex state Lv, Gang; Zhang, Hong; Cao, Xuecheng Applied Physics Letters, Vol. 103, Issue 25 https://doi.org/10.1063/1.4850537	journal	December 2013
The design and verification of MuMax3 Vansteenkiste, Arne; Leliaert, Jonathan; Dvornik, Mykola AIP Advances, Vol. 4, Issue 10 https://doi.org/10.1063/1.4899186	journal	October 2014
Ultrafast domain wall dynamics in magnetic nanotubes and nanowires Hertel, R. Journal of Physics: Condensed Matter, Vol. 28, Issue 48 https://doi.org/10.1088/0953-8984/28/48/483002	journal	October 2016
New spiral state and skyrmion lattice in 3D model of chiral magnets Rybakov, Filipp N.; Borisov, Aleksandr B.; Blügel, Stefan New Journal of Physics, Vol. 18, Issue 4 https://doi.org/10.1088/1367-2630/18/4/045002	journal	April 2016
Computation of the magnetic domain structure in bulk permalloy Hertel, Riccardo; Kronmüller, Helmut Physical Review B, Vol. 60, Issue 10 https://doi.org/10.1103/PhysRevB.60.7366	journal	September 1999
Domain wall induced switching of whisker-based tunnel junctions Schäfer, R.; Urban, R.; Ullmann, D. Physical Review B, Vol. 65, Issue 14 https://doi.org/10.1103/PhysRevB.65.144405	journal	March 2002
Micromagnetic study of Bloch-point-mediated vortex core reversal Thiaville, André; García, José Miguel; Dittrich, Rok Physical Review B, Vol. 67, Issue 9 https://doi.org/10.1103/PhysRevB.67.094410	journal	March 2003
Vortices in thin ferromagnetic films and the skyrmion number Tretiakov, O. A.; Tchernyshyov, O. Physical Review B, Vol. 75, Issue 1 https://doi.org/10.1103/PhysRevB.75.012408	journal	January 2007
Bloch point structure in a magnetic nanosphere Pylypovskyi, Oleksandr V.; Sheka, Denis D.; Gaididei, Yuri Physical Review B, Vol. 85, Issue 22 https://doi.org/10.1103/PhysRevB.85.224401	journal	June 2012
Pinning of a Bloch point by an atomic lattice Kim, Se Kwon; Tchernyshyov, Oleg Physical Review B, Vol. 88, Issue 17 https://doi.org/10.1103/PhysRevB.88.174402	journal	November 2013
Observation of Bloch-point domain walls in cylindrical magnetic nanowires Da Col, S.; Jamet, S.; Rougemaille, N. Physical Review B, Vol. 89, Issue 18 https://doi.org/10.1103/PhysRevB.89.180405	journal	May 2014
Mechanisms for the symmetric and antisymmetric switching of a magnetic vortex core: Differences and common aspects Noske, Matthias; Stoll, Hermann; Fähnle, Manfred Physical Review B, Vol. 91, Issue 1 https://doi.org/10.1103/PhysRevB.91.014414	journal	January 2015
Switching of a target skyrmion by a spin-polarized current Liu, Yan; Du, Haifeng; Jia, Min Physical Review B, Vol. 91, Issue 9 https://doi.org/10.1103/PhysRevB.91.094425	journal	March 2015
Interacting tails of asymmetric domain walls: Theory and experiments Döring, Lukas; Hengst, Claudia; Otto, Felix Physical Review B, Vol. 93, Issue 2 https://doi.org/10.1103/PhysRevB.93.024414	journal	January 2016
Controlled Switching of Néel Caps in Flux-Closure Magnetic Dots Cheynis, F.; Masseboeuf, A.; Fruchart, O. Physical Review Letters, Vol. 102, Issue 10 https://doi.org/10.1103/PhysRevLett.102.107201	journal	March 2009
Dimensionality Crossover in Magnetism: From Domain Walls (2D) to Vortices (1D) Masseboeuf, A.; Fruchart, O.; Toussaint, J. C. Physical Review Letters, Vol. 104, Issue 12 https://doi.org/10.1103/PhysRevLett.104.127204	journal	March 2010
Exchange Explosions: Magnetization Dynamics during Vortex-Antivortex Annihilation Hertel, Riccardo; Schneider, Claus M. Physical Review Letters, Vol. 97, Issue 17 https://doi.org/10.1103/PhysRevLett.97.177202	journal	October 2006
A Non-Local Algorithm for Image Denoising Buades, A.; Coll, B.; Morel, J. -M. 2005 IEEE Computer Society Conference on Computer Vision and Pattern Recognition (CVPR'05) https://doi.org/10.1109/CVPR.2005.38	conference	January 2005
Deconfined Quantum Critical Points Senthil, T. Science, Vol. 303, Issue 5663 https://doi.org/10.1126/science.1091806	journal	March 2004
Blowing magnetic skyrmion bubbles Jiang, W.; Upadhyaya, P.; Zhang, W. Science, Vol. 349, Issue 6245 https://doi.org/10.1126/science.aaa1442	journal	June 2015
Controlled Injection of a Singular Point along a Linear Magnetic Structure Thiaville, A.; Miltat, J. Europhysics Letters (EPL), Vol. 26, Issue 1 https://doi.org/10.1209/0295-5075/26/1/010	journal	April 1994
Nanoscale switch for vortex polarization mediated by Bloch core formation in magnetic hybrid systems Wohlhüter, Phillip; Bryan, Matthew T.; Warnicke, Peter ETH Zurich https://doi.org/10.3929/ethz-b-000104181	text	January 2015
Dimensionality cross-over in magnetism: from domain walls (2D) to vortices (1D) Masseboeuf, Aurélien; Fruchart, Olivier; Toussaint, Jean-Christophe arXiv https://doi.org/10.48550/arxiv.0909.2952	text	January 2009
Observation of Bloch-point domain walls in cylindrical magnetic nanowires Da Col, Sandrine; Jamet, Segolene; Rougemaille, Nicolas arXiv https://doi.org/10.48550/arxiv.1311.7368	text	January 2013

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