A. Thiaville

Laboratoire de physique des Solides

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J. Miltat

Laboratoire de physique des Solides

Stanislas Rohart

Laboratoire de physique des Solides

Y. Nakatani

University of Electro-Communications

J. Sampaio

Laboratoire de physique des Solides

V. Jeudy

Université Paris-Saclay

S. Pizzini

Institut Néel

A. Fert

Centre National de la Recherche Scientifique

Teruo Ono

Kyoto University Institute for Chemical Research

D. Ravelosona

Centre National de la Recherche Scientifique

M. Belmeguenai

Université Sorbonne Paris Nord

Cooperative Institutions

Centre National de la Recherche Scientifique

248

Université Paris-Sud

100

Université Paris-Saclay

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Leibniz Institute for Solid State and Materials Research

Laboratoire de physique des Solides

Université Paris Cité

Université Grenoble Alpes

CEA Grenoble

Sorbonne Université

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Magnetic vortices in nanowires with transverse easy axis

Physical Review B (2009)

L. Vila Michaël Darques A. Encinas U. Ebels Jean‐Marie George

We present magnetotransport measurements as well as micromagnetic simulations of magnetization reversal in magnetic nanowires having strong transverse magnetocrystalline anisotropy. The interplay between exchange, demagnetizing, and magnetocrystalline energies gives rise to a micromagnetic configuration involving vortices with alternative chirality along the wire. Despite the complexity of the field angle-dependent magnetization reversal process, a very good agreement is obtained between experiments and simulations. This provides evidence that the reported magnetization process appears generally in nanowires with strong transverse magnetocrystalline anisotropy. Moreover an analytical expression is established for the angular dependency of the core switching field. The simulations indicate the occurrence of Bloch points during the core reversal.

Magnetocrystalline anisotropy

Micromagnetics

10.1103/physrevb.79.172410

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Citations (32)

Nucleation and dynamics of magnetic vortices under spin-polarized current

Physical Review B (2008)

Y. Nakatani Junya Shibata Gen Tatara Hiroshi Kohno A. Thiaville

Spin-polarized current in a ferromagnet is known to lead to the instability of the uniformly magnetized state. In this paper, it is demonstrated by micromagnetic simulations that, in films or wide wires, the above instability is followed by the formation of magnetic vortices. Subsequent magnetization dynamics is also studied in terms of vortices, which includes pair dynamics and pair annihilation. Using a simple analytical model that considers the vortices as points, the dynamics of two interacting vortices under the current is classified according to their vorticity and polarity. This explains well the essential features of the simulation results.

Polarity (international relations)

Vortex state

Dynamics

Magnetization dynamics

10.1103/physrevb.77.014439

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Citations (26)

Direct measurement of interfacial Dzyaloshinskii-Moriya interaction inX|CoFeB|MgOheterostructures with a scanning NV magnetometer(X=Ta,TaN

Physical review. B./Physical review. B (2016)

I. Gross Luis Javier Martínez Jean‐Philippe Tetienne T. Hingant Jean-François Roch

The Dzyaloshinskii-Moriya Interaction (DMI) has recently attracted considerable interest owing to its fundamental role in the stabilization of chiral spin textures in ultrathin ferromagnets, which are interesting candidates for novel spintronic technologies. Here, the authors present an experimental study of the DMI strength that is induced in nanometer-thick CoFeB ferromagnetic thin films in contact with different nonmagnetic metal underlayers. They use a novel technique for noninvasive high-sensitivity sensing of magnetic field: a scanning nanomagnetometer based on the magnetic response of a single nitrogen-vacancy defect in diamond. The magnetic domain walls are mapped, the spin structure and type of domain wall determined, and the DMI strength extracted. Importantly, the authors find local variation of the DMI constant, which clearly suggests that local field mapping techniques are extremely important to study this physics.

10.1103/physrevb.94.064413

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Citations (70)

Material considerations for vertical Bloch lines direct observation and dynamical study

IEEE Transactions on Magnetics (1991)

J. Ben Youssef A. Thiaville O. Navarro J. M. Desvignes H. Le Gall

The authors report on a materials growth study undertaken to clarify the origin of vertical Bloch lines contrast by direct optical observation in dark field on bubble garnet samples. The authors' initial guess (a large Faraday rotation) was shown to be incorrect. Rather, the influence of a low quality factor (the ratio of uniaxial energy constant to the demagnetizing energy) was detected. This agrees with a model wherein the wall tilts out of the vertical plane, at the line position. A control of lines observation is thus possible. The authors demonstrate it for specific samples grown to be put in a bias field gradient system stabilizing one single wall.< >

Line (geometry)

Position (finance)

10.1109/20.278884

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Citations (3)

Electrical rectification effect in single domain magnetic microstrips: A micromagnetics-based analysis

Journal of Applied Physics (2008)

A. Thiaville Y. Nakatani

Upon passing an ac electrical current along magnetic micro- or nanostrips, the measurement of a dc voltage that depends sensitively on current frequency and applied field has been recently reported by Yamaguchi et al. [Appl. Phys. Lett. 90, 182507 (2007); e-print arXiv:0710.2172; Phys. Rev. B 78, 104401 (2008)]. It was attributed to the excitation of spin waves by the spin transfer torque, leading to a time-varying anisotropic magnetoresistance, and by mixing of ac current and resistance to a dc. voltage. We have performed a quantitative analysis by micromagnetics including the spin transfer torque terms considered usually of this situation. The signals found from the spin transfer torque effect are several orders of magnitude below the experimental values, even if a static inhomogeneity of magnetization (the so-called ripple) is taken into account. On the other hand, the presence of a small nonzero average Oersted field is shown to be consistent with the full set of experimental results, both qualitatively and quantitatively. We examine, quantitatively, several sources for this average field and point to the contacts of the sample as a likely origin.

Micromagnetics

Spin-transfer torque

10.1063/1.3006005

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Citations (14)

Skyrmion morphology in ultrathin magnetic films

Bulletin of the American Physical Society (2018)

M. Jaleel Akhtar I. Gross Aleš Hrabec J. Sampaio Luis Javier Martínez

Morphology

Skyrmion

Source

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Citations (0)

Electrical Manipulation of Magnetization in Nanomagnet

한국자기학회 학술연구발표회 논문개요집 (2007)

Teruo Ono Kana Yamada H. Tanigawa S. Kasai K. Kobayashi

Nanomagnet

Source

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Citations (0)

Strength and length scale of the interaction between domain walls and pinning disorder in thin ferromagnetic films

Physical Review Research (2020)

Pierre Géhanne Stanislas Rohart A. Thiaville V. Jeudy

We explore the magnetic-field-driven motion of domain walls with different chiralities in thin ferromagnetic films made of Pt/Co/Pt, Au/Co/Pt, and Pt/Co/Au. From the analysis of domain wall dynamics, we extract parameters characterizing the interaction between domain walls and weak pinning disorder of the films. The variations of domain wall structure, controlled by an in-plane field, are found to modify the characteristic length scale of pinning in strong correlation with the domain wall width, whatever its chirality and the interaction strength between domain walls and pinning defects. These findings should be also relevant for a wide variety of elastic interfaces moving in weak pinning disordered media.Received 25 May 2020Revised 22 September 2020Accepted 7 October 2020DOI:https://doi.org/10.1103/PhysRevResearch.2.043134Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasDomain wallsMagnetization dynamicsMicromagnetismPhysical SystemsThin filmsTechniquesMagneto-optical Kerr effectCondensed Matter & Materials Physics

Domain wall (magnetism)

10.1103/physrevresearch.2.043134

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Citations (10)

ChemInform Abstract: Micromagnetics: Dynamical Aspects

ChemInform (2002)

J. Miltat Gonçalo Albuquerque A. Thiaville

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Micromagnetics

10.1002/chin.200211220

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Citations (1)

Domain wall propagation by spin-orbit torques in in-plane magnetized systems

Physical review. B./Physical review. B (2020)

Ryuhei Kohno J. Sampaio Stanislas Rohart A. Thiaville

The effect of dampinglike spin-orbit torque (DL SOT) on magnetic domain walls (DWs) in in-plane magnetized soft tracks is studied analytically and with micromagnetic simulations. We find that DL SOT drives vortex DWs, whereas transverse DWs, the other typical DW structure in soft tracks, propagate only if the Dzyaloshinskii-Moriya interaction (DMI) is present. The SOT drive can add to, and be more efficient than, spin-transfer torque (STT), and so may greatly benefit applications that require in-plane DWs. Our analysis based on the Thiele equation shows that the driving force arises from a cycloidal distortion of the DW structure caused by geometrical confinement or DMI. This distortion is higher, and the SOT more efficient, in narrower, thinner tracks. These results show that the effects of SOT cannot be understood by simply considering the effective field at the center of the structure, an ill-founded but often-used estimation. We also show that the relative magnitude of STT and DL SOT can be determined by comparing the motion of different vortex DW structures in the same track.

Distortion (music)

Domain wall (magnetism)

Orbit (dynamics)

Micromagnetics

10.1103/physrevb.102.020410

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Citations (4)