Elucidation of the Mechanism for Maintaining Ultrafast Domain Wall Mobility Over a Wide Temperature Range

Abstract To realize a data rate of 20 Gbps in the communication standard 5G with a racetrack memory, it is crucial to stably recognize a domain-wall (DW) velocity (vDW) of 1200 m/s when the minimum bit length is 60 nm. However, general vDW is as slow as about 100 m/s. Recent reports indeed showed that the fast DW motion occurs using an in-plane external magnetic field however, this mechanism is unsuitable because the rear-edge vDW decelerated, which contrary to the front-edge of DW velocity. Therefore, we designed magnetic wires by bringing the g values of rare-earth and transition-metals close to each other and suppressing the Joule heat generation distribution due to short pulse current, we successfully demonstrated the vDW of 1200 m/s in a wide temperature range without using an external magnetic field. Moreover, the current density (J) is low, and the DW mobility (vDW/J) is significantly improved 10-times over a wide temperature range compared to other reports.

Download Full-text

Magnetoimpedance of Amorphous Ferromagnetic CoFeSiB Ribbons in the Wide Temperature Range

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.215.337 ◽

2014 ◽

Vol 215 ◽

pp. 337-341 ◽

Cited By ~ 3

Author(s):

Alexander V. Semirov ◽

Michael S. Derevyanko ◽

Dmitriy A. Bukreev ◽

Alexey A. Moiseev ◽

Galina V. Kurlyandskaya

Keyword(s):

Magnetic Field ◽

External Magnetic Field ◽

Wide Temperature Range ◽

Tensile Stresses ◽

Temperature Range ◽

Temperature Dependences ◽

Magnetostriction Constant

The influence of the temperature, elastic tensile stresses and external magnetic field on the impedance of amorphous Co75Fe5Si4B16 ribbons was studied. It was observed that the character of the elastic tensile stresses influences the impedance and its changes in the external magnetic field are determined by a temperature of the ribbons. It was shown that changes of the stressimpedance character and magnetoimpedance temperature dependences were caused by a change in the sign of a magnetostriction constant with the temperature.

Download Full-text

Domain wall mobility engineering by a perpendicular magnetic field in microwires with a gradient of perpendicular anisotropy

AIP Advances ◽

10.1063/9.0000120 ◽

2021 ◽

Vol 11 (3) ◽

pp. 035014

Author(s):

L. Fecova ◽

K. Richter ◽

R. Varga

Keyword(s):

Magnetic Field ◽

Domain Wall ◽

Perpendicular Magnetic Field ◽

Perpendicular Anisotropy ◽

Domain Wall Mobility ◽

Wall Mobility

Download Full-text

Domain wall mobility and roughening in doped ferroelectric hexagonal manganites

Physical Review Research ◽

10.1103/physrevresearch.2.033159 ◽

2020 ◽

Vol 2 (3) ◽

Author(s):

D. R. Småbråten ◽

T. S. Holstad ◽

D. M. Evans ◽

Z. Yan ◽

E. Bourret ◽

...

Keyword(s):

Domain Wall ◽

Domain Wall Mobility ◽

Hexagonal Manganites ◽

Wall Mobility

Download Full-text

Giant conductivity of mobile non-oxide domain walls

Nature Communications ◽

10.1038/s41467-021-24160-2 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

S. Ghara ◽

K. Geirhos ◽

L. Kuerten ◽

P. Lunkenheimer ◽

V. Tsurkan ◽

...

Keyword(s):

Magnetic Fields ◽

Domain Wall ◽

Domain Walls ◽

Building Blocks ◽

External Fields ◽

Tail Domain ◽

Oxide Electronics ◽

Domain Wall Mobility ◽

Conductance Changes ◽

Wall Mobility

AbstractAtomically sharp domain walls in ferroelectrics are considered as an ideal platform to realize easy-to-reconfigure nanoelectronic building blocks, created, manipulated and erased by external fields. However, conductive domain walls have been exclusively observed in oxides, where domain wall mobility and conductivity is largely influenced by stoichiometry and defects. Here, we report on giant conductivity of domain walls in the non-oxide ferroelectric GaV4S8. We observe conductive domain walls forming in zig-zagging structures, that are composed of head-to-head and tail-to-tail domain wall segments alternating on the nanoscale. Remarkably, both types of segments possess high conductivity, unimaginable in oxide ferroelectrics. These effectively 2D domain walls, dominating the 3D conductance, can be mobilized by magnetic fields, triggering abrupt conductance changes as large as eight orders of magnitude. These unique properties demonstrate that non-oxide ferroelectrics can be the source of novel phenomena beyond the realm of oxide electronics.

Download Full-text

An Investigation of Close-Electrode Intensification in a dc Arc in a Magnetic Field

Applied Spectroscopy ◽

10.1366/000370270774372245 ◽

1970 ◽

Vol 24 (1) ◽

pp. 95-98 ◽

Cited By ~ 1

Author(s):

A. Petrakiev ◽

R. Milanova

Keyword(s):

Magnetic Field ◽

External Magnetic Field ◽

Cathode Region ◽

Spectral Lines ◽

Anode Region ◽

Temperature Range ◽

Dc Arc

An investigation of the distribution of the intensity of spectral lines in the gap length of a copper dc arc of 7A, burning both with and without nonhomogenous magnetic field, will be described in this paper. The close-electrode intensification effect of spectral lines has been observed and its variation with the time of preliminary burning and the gap length has been investigated. It has been established that close-electrode intensification appears only with the ionic lines. An increase of the intensity of some spectral lines and certain variations in their distribution have been observed when the arc is burning in a magnetic field. The temperature range has been studied in its relationship to the gap length. The temperature around the cathode region is approximately 6500 K and that around the anode region is about 6000 K. The superposition of an external magnetic field contributes to an increase of the temperature of about 400 K. Some possibilities for the application of these effects in the case of spectral analytical determinations have been suggested.

Download Full-text