Common universal behavior of magnetic domain walls driven by spin-polarized electrical current and magnetic field

We show that a type of magnetic domain walls (DWs) can be monitored by anisotropic magnetoresistance (AMR) measurements due to a specific DW volume depending on the DW type in NiFe magnetic wires. A circular DW injection pad is used to generate DWs at a low magnetic field, resulting in reliable DW introduction into magnetic wires. DW pinning is induced by a change of DW energy at an asymmetric single notch. The injection of DW from the circular pad and its pinning at the notch is observed by using AMR and magnetic force microscope (MFM) measurements. A four-point probe AMR measurement allows us to distinguish the DW type in the switching process because DWs are pinned at the single notch, where voltage probes are closely placed around the notch. Two types of AMR behavior are observed in the AMR measurements, which is owing to a change of DW structures. MFM images and micromagnetic simulations are consistent with the AMR results.

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White Synchrotron Radiation Topography of (11̄0) Nickel Single Crystal

Zeitschrift für Naturforschung A ◽

10.1515/zna-1982-0516 ◽

1982 ◽

Vol 37 (5) ◽

pp. 505-511

Author(s):

J. D. Stephenson

Keyword(s):

Magnetic Field ◽

Synchrotron Radiation ◽

Single Crystal ◽

Domain Structure ◽

Domain Walls ◽

Magnetic Domain ◽

Nickel Single Crystal ◽

Magnetic Domain Walls ◽

Equivalent Field ◽

Nickel Crystal

Changes in 70.53° magnetic domain structure on the surface of a perfect (11̄0) nickel crystal have been observed using white synchrotron X-radiation topography. The crystal was influenced by a variable [11̄0] magnetic field. At field strengths ≿ 100 A/m [111̄]-spike domains, thought to be traces of [011], 70.53° (oblique) magnetic domain walls, appeared within [111]-bands (0.4 mm wide) in the topographs. Reversal of the field produced similar spikes at equivalent field values but in different regions of the crystal.

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Experimental Study and Numerical Modelling of Magnetic Domain Walls Drift in Ferrite Garnet Crystals

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.215.437 ◽

2014 ◽

Vol 215 ◽

pp. 437-442 ◽

Cited By ~ 4

Author(s):

Lidia A. Pamyatnykh ◽

Georgy A. Shmatov ◽

Mikhail S. Lysov ◽

Sergey E. Pamyatnykh ◽

Dmitry S. Mehonoshin

Keyword(s):

Magnetic Field ◽

Experimental Study ◽

Numerical Modelling ◽

Linear Function ◽

Qualitative Agreement ◽

Domain Walls ◽

Magnetic Domain ◽

Ferrite Garnet ◽

Magnetic Domain Walls ◽

Oscillating Magnetic Field

The results of study of domain walls oscillations in harmonic magnetic field H = H0sin (2πft) oriented perpendicular to ferrite garnet (TbErGd)3(FeAl)5O12 (111) sample plate for amplitudes that include the drift of domain walls are reported. Numerical modelling of domain walls motion was performed for frequencies f~102 Hz, where the drift is observed experimentally. Comparison of results of numerical modelling with experimental results shows their qualitative agreement. It was established that domain walls oscillations amplitude is a linear function of amplitude of oscillating magnetic field.

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Impedance Profile of a HFC-Type Magnetic Field Sensor with Inclined Magnetic Domain Walls, and Method of Controlling the Domain Wall Angle

Journal of the Magnetics Society of Japan ◽

10.3379/jmsjmag.27.832 ◽

2003 ◽

Vol 27 (7) ◽

pp. 832-838 ◽

Cited By ~ 5

Author(s):

T. Nakai ◽

H. Abe ◽

S. Yabukami ◽

M. Yamaguchi ◽

K.I. Arai

Keyword(s):

Magnetic Field ◽

Domain Wall ◽

Domain Walls ◽

Magnetic Domain ◽

Magnetic Field Sensor ◽

Wall Angle ◽

Magnetic Domain Walls ◽

Field Sensor ◽

Impedance Profile

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Magnetic Recording Systems: Magnetic Domain Walls Dynamic Due To Spin Transfer Torque, Spin Orbit Torques and Applied Magnetic Field Simultaneously

Journal of Superconductivity and Novel Magnetism ◽

10.1007/s10948-021-06089-1 ◽

2021 ◽

Author(s):

Joseph Duclair Noula Tefouet ◽

Armel Viquit Sonna

Keyword(s):

Magnetic Field ◽

Magnetic Recording ◽

Applied Magnetic Field ◽

Domain Walls ◽

Magnetic Domain ◽

Spin Transfer Torque ◽

Spin Transfer ◽

Spin Orbit ◽

Magnetic Domain Walls

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Magnetic Force Microscopic Study on Domain-Wall Molecules in NiFe Nano Rings

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.152-153.529 ◽

2009 ◽

Vol 152-153 ◽

pp. 529-532

Author(s):

Kohei Sasage ◽

Naoya Okamoto ◽

Hana Tsujikawa ◽

Takehiro Yamaoka ◽

Eiji Saitoh

Keyword(s):

Magnetic Field ◽

Magnetic Force Microscopy ◽

Magnetic Force ◽

Domain Walls ◽

Magnetic Domain ◽

Threshold Value ◽

Magnetostatic Interaction ◽

Stray Magnetic Field ◽

Force Microscopy ◽

Magnetic Domain Walls

A pair of magnetic domain walls (DWs) in ferromagnetic NiFe rings has been investigated in terms of the magnetic force microscopy (MFM). When the distance between the rings d is greater than a threshold value dth, MFM signals indicate that a DW in the ring is dragged due to a stray magnetic field from an MFM probe tip. When d < dth, this drag signals disappears; DWs are bound to each other by the DW-DW interaction. This transition can be argued in terms of the competition between the DW-DW magnetostatic interaction and the DW-drag potential. From the d-dependent MFM data, the DW-drag potential was estimated.

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Magnetic Domain Walls in Nanowires

MRS Bulletin ◽

10.1557/mrs2006.100 ◽

2006 ◽

Vol 31 (5) ◽

pp. 395-399 ◽

Cited By ~ 11

Author(s):

Rolf Allenspach ◽

Pierre-Olivier Jubert

Keyword(s):

Domain Wall ◽

Domain Walls ◽

Magnetic Domain ◽

Electrical Current ◽

Spin Transfer ◽

Wall Structure ◽

Conduction Electrons ◽

Magnetic Domain Walls ◽

Complex Spin ◽

Small Elements

AbstractFor many decades, it was assumed that the characteristics of magnetic domain walls were determined by material properties and the walls were moved by magnetic fields.In the past few years, it has been shown that domain walls behave differently on the nanometer scale.Domain walls in small elements exhibit complex spin arrangements that strongly deviate from the wall types commonly encountered in magnetic thin-film systems, and they can be modified by changing the geometry of the element.Domain walls in nanowires can also be moved by injecting electrical current pulses.Whereas wall propagation is qualitatively explained by a spin transfer from the conduction electrons to the spins of the domain wall, important aspects of the observations cannot be explained by present models.Examples include the observation of a drastic transformation of the wall structure upon current injection and domain wall velocities that tend to be orders of magnitude smaller than anticipated from theory.

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