Direct visualization of magnetic domain wall motion in Nd-Fe-B magnets by alternating magnetic force microscopy using Co-GdO superparamagnetic tip

ABSTRACTIn this study, we conducted the in-situ observations of the magnetic domain structure change in Nd2Fe14B magnets at elevated temperature by transmission electron microscopy (TEM) / Lorentz microscopy. The in-situ observations in Nd2Fe14B magnets revealed that the magnetization reversal easily occurred at the elevated temperature. At more than 180°C, the magnetic domain wall motion could be observed by applying the magnetic field of less than 20 mT. The motion of the magnetic domain wall was discontinuous and the domain wall jumped to one grain boundary to the neighboring grain boundary at 180°C. On the other hand, the continuous domain wall motion within grain interior as well as discontinuous domain wall motion was observed at 225°C, and some grain boundaries showed still strong pinning effect even at 225°C. The temperature dependence of the pinning effect of grain boundaries would not uniform.

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Dependence of Magnetic Domain-Wall Motion on a Fast Changing Current

Physical Review Letters ◽

10.1103/physrevlett.103.197204 ◽

2009 ◽

Vol 103 (19) ◽

Cited By ~ 41

Author(s):

Lars Bocklage ◽

Benjamin Krüger ◽

Toru Matsuyama ◽

Markus Bolte ◽

Ulrich Merkt ◽

...

Keyword(s):

Domain Wall ◽

Wall Motion ◽

Magnetic Domain ◽

Domain Wall Motion ◽

Magnetic Domain Wall

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Distribution of critical current density for magnetic domain wall motion

Journal of Applied Physics ◽

10.1063/1.4866394 ◽

2014 ◽

Vol 115 (17) ◽

pp. 17D508 ◽

Cited By ~ 3

Author(s):

S. Fukami ◽

M. Yamanouchi ◽

Y. Nakatani ◽

K.-J. Kim ◽

T. Koyama ◽

...

Keyword(s):

Domain Wall ◽

Critical Current Density ◽

Critical Current ◽

Current Density ◽

Wall Motion ◽

Magnetic Domain ◽

Domain Wall Motion ◽

Magnetic Domain Wall

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Crossed-Ratchet Effects for Magnetic Domain Wall Motion

Physical Review Letters ◽

10.1103/physrevlett.100.037203 ◽

2008 ◽

Vol 100 (3) ◽

Cited By ~ 44

Author(s):

A. Pérez-Junquera ◽

V. I. Marconi ◽

A. B. Kolton ◽

L. M. Álvarez-Prado ◽

Y. Souche ◽

...

Keyword(s):

Domain Wall ◽

Wall Motion ◽

Magnetic Domain ◽

Domain Wall Motion ◽

Magnetic Domain Wall ◽

Ratchet Effects

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Magnetic Domain Wall Motion

Spintronics ◽

10.1007/978-981-16-0069-2_6 ◽

2021 ◽

pp. 145-161

Author(s):

Puja Dey ◽

Jitendra Nath Roy

Keyword(s):

Domain Wall ◽

Wall Motion ◽

Magnetic Domain ◽

Domain Wall Motion ◽

Magnetic Domain Wall

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Differential Domain Wall Propagation in Y-Shaped Permalloy Nanowire Devices

SPIN ◽

10.1142/s2010324716500065 ◽

2016 ◽

Vol 06 (01) ◽

pp. 1650006 ◽

Cited By ~ 2

Author(s):

Bipul Das ◽

Ting-Chieh Chen ◽

Deng-Shiang Shiu ◽

Lance Horng ◽

Jong-Ching Wu

Keyword(s):

Domain Wall ◽

Magnetic Force ◽

Magnetic Domain ◽

Topological Defects ◽

Circular Disk ◽

Geometrical Shape ◽

Magnetic Domain Wall ◽

Force Microscopy ◽

Junction Structure

Here, we report an investigation of magnetic domain wall (DW) evolution and propagation in Y-shaped permalloy (Py) nanowire (NW) devices. The devices are fabricated using standard electron-beam lithography technique. Each device consists of three connected NWs that form a Y-junction structure with one branch connecting either symmetrically or asymmetrically to a circular disk for DW nucleation. The DW dynamics in the devices are studied by in situ magnetic force microscopy (MFM) by pinning the DWs to triangular notches at each branch of the two devices. We observe that the DW injection field values differ depending on whether they are connected to the circular disks symmetrically or asymmetrically. However, after they pass the Y-junctions, a selection is made by the DWs to propagate easily either through both or through only one particular outgoing branch of the devices. The experimental observations are analyzed by micromagnetic simulation. It can be inferred from the results that the influence of detailed geometrical shape of the devices leads to significantly different interactions among the innate topological defects and the notches with the injected DWs.

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Electric Field Driven Magnetic Domain Wall Motion in Iron Garnet Films

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.152-153.143 ◽

2009 ◽

Vol 152-153 ◽

pp. 143-146 ◽

Cited By ~ 5

Author(s):

A. Logginov ◽

G. Meshkov ◽

A. Nikolaev ◽

E. Nikolaeva ◽

A. Pyatakov ◽

...

Keyword(s):

Domain Wall ◽

Electric Field ◽

Wall Motion ◽

Magnetic Domain ◽

Domain Wall Motion ◽

Gadolinium Gallium Garnet ◽

Magnetic Domain Wall ◽

Garnet Films ◽

Dynamic Observation ◽

Iron Garnet

The room temperature magnetoelectric effect was observed in epitaxial iron garnet films that appeared as magnetic domain wall motion induced by electric field. The films grown on gadolinium-gallium garnet substrates with various crystallographic orientations were examined. The effect was observed in (210) and (110) films and was not observed in (111) films. Dynamic observation of the domain wall motion in 800 kV/cm electric field pulses gave the domain wall velocity in the range 30÷50 m/s. Similar velocity was achieved in magnetic field pulse about 50 Oe.

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