Thermally activated domain wall motion and coercive field in materials with extremely narrow domain walls

1979 ◽  
Vol 96 (1) ◽  
pp. 343-350 ◽  
Author(s):  
M. Fähnle ◽  
H. Kronmüller ◽  
B. Barbara
Keyword(s):  
Domain Wall ◽  
Coercive Field ◽  
Wall Motion ◽  
Domain Walls ◽  
Domain Wall Motion ◽  
Thermally Activated

scholarly journals Monte Carlo Simulation of Magnetization Reversal Via Domain-Wall Motion in Fe Sesquilayers on W(110)

1997 ◽  
Vol 492 ◽  
Author(s):  
M. Kolesik ◽  
M. A. Novotny ◽  
Per Arne Rikvold
Keyword(s):  
Monte Carlo Simulation ◽  
Domain Wall ◽  
Ultrathin Films ◽  
Wall Motion ◽  
Domain Walls ◽  
Domain Wall Motion ◽  
Atomic Layer ◽  
Thermally Activated ◽  
Insight Into

ABSTRACTIron sesquilayers are ultrathin films with coverages between one and two atomic mono-layers. They consist of an almost defect-free monolayer with compact islands of a second atomic layer on top. This variation of the film thickness results in a strong interaction between domain walls and the island structure. It makes these systems an ideal laboratory to study the dynamics of domain walls driven by weak external fields. We present computer simulations which provide insight into the role of the thermally activated nucleation processes by which a driven domain wall overcomes the obstacles created by the islands.

scholarly journals Generalized analysis of thermally activated domain-wall motion in Co/Pt multilayers

2015 ◽  
Vol 378 ◽  
pp. 98-106 ◽  
Author(s):  
Satoru Emori ◽  
Chinedum K. Umachi ◽  
David C. Bono ◽  
Geoffrey S.D. Beach
Keyword(s):  
Domain Wall ◽  
Wall Motion ◽  
Domain Wall Motion ◽  
Thermally Activated

Electrical Control of Magnetic Multi-Domain Transformation in a Specific Geometric-Patterned Ni Nanostructure on a Piezoelectric [Pb(Mg1/3Nb2/3)O3]0.68–[PbTiO3]0.32 Substrate

2016 ◽  
Author(s):  
Yu-Jen Chen ◽  
Tien-Kan Chung ◽  
Po-Jung Lin ◽  
Chiao-Fang Hung ◽  
Hou-Jen Chu ◽  
...  
Keyword(s):  
Domain Wall ◽  
Data Storage ◽  
Wall Motion ◽  
Domain Walls ◽  
Magnetoelectric Effect ◽  
Domain Wall Motion ◽  
Electrical Control ◽  
Domain State ◽  
Memory Applications ◽  
Domain Transformation

In this paper, we report an electrical control of magnetic multi-domain-walls transformation in an N-shape-patterned Ni nanostructures on a piezoelectric [Pb(Mg1/3Nb2/3)O3]0.68–[PbTiO3]0.32 substrate. Based on the converse-magnetoelectric-effect induced domain-wall transformation and the specific N-shape geometry guided domain-wall motion, the domain walls are successfully transformed by an applied electric field of 0.8 MV/m from the transverse domain wall state into the flux closure vortex domain state. These experimental results achieve the electrical control of multi-domain-walls transformation and would create more data storage and memory applications in the future.

Magnetic dipole interactions in dysprosium ethyl sulphate III. Magnetic and thermal properties below the Curie point

1968 ◽  
Vol 306 (1486) ◽  
pp. 335-353 ◽  
Keyword(s):  
Domain Wall ◽  
Magnetic Dipole ◽  
Wall Motion ◽  
Domain Walls ◽  
Domain Wall Motion ◽  
Single Spin ◽  
Relaxation Effects ◽  
Dipole Interactions ◽  
Spin Interactions ◽  
Spin Reversal

The thermal and magnetic properties of dysprosium ethyl sulphate have been measured at temperatures below its Curie temperature of 0⋅13 °K. The ferromagnetism is shown to be due almost entirely to magnetic dipole interactions which are highly anisotropic corresponding to a zero magnetic g -value perpendicular to the c -axis. The system thus approximates closely to a ferromagnetic Ising model. Because of demagnetizing effects the low field proper­ties are dominated by the formation of domains, which are shown to be long and thin with unusually abrupt domain walls. Measurements of the initial susceptibility at frequencies between 25 and 900 c/s show marked relaxation effects which are interpreted in terms of both domain wall motion and single spin reversals. A discussion is given of the general problem of finding the real and imaginary susceptibility components in systems with strong dipolar interactions. In favourable cases, such as dysprosium ethyl sulphate, it is possible to find a shape-independent quasi-static susceptibility which corresponds to the response of the system in the absence of domain wall motion and demagnetizing effects. Values for the spin-reversal relaxation time are found to be of the order of tens of microseconds which is surprisingly short in view of the absence of non-diagonal terms in the spin-spin interactions.

scholarly journals Current-Driven Domain Wall Motion in Curved Ferrimagnetic Strips Above and Below the Angular Momentum Compensation

2021 ◽  
Vol 9 ◽  
Author(s):  
D. Osuna Ruiz ◽  
O. Alejos ◽  
V. Raposo ◽  
E. Martínez
Keyword(s):  
Angular Momentum ◽  
Domain Wall ◽  
High Speed ◽  
Wall Motion ◽  
Domain Walls ◽  
Relaxation Times ◽  
Domain Wall Motion ◽  
Current Density Distribution ◽  
Terminal Velocity ◽  
Artificial System

Current driven domain wall motion in curved Heavy Metal/Ferrimagnetic/Oxide multilayer strips is investigated using systematic micromagnetic simulations which account for spin-orbit coupling phenomena. Domain wall velocity and characteristic relaxation times are studied as functions of the geometry, curvature and width of the strip, at and out of the angular momentum compensation. Results show that domain walls can propagate faster and without a significant distortion in such strips in contrast to their ferromagnetic counterparts. Using an artificial system based on a straight strip with an equivalent current density distribution, we can discern its influence on the wall terminal velocity, as part of a more general geometrical influence due to the curved shape. Curved and narrow ferrimagnetic strips are promising candidates for designing high speed and fast response spintronic circuitry based on current-driven domain wall motion.

scholarly journals Thermally activated domain wall motion in [Co/Ni](111) superlattices with perpendicular magnetic anisotropy

2015 ◽  
Vol 106 (6) ◽  
pp. 062406 ◽  
Author(s):  
S. Le Gall ◽  
N. Vernier ◽  
F. Montaigne ◽  
M. Gottwald ◽  
D. Lacour ◽  
...  
Keyword(s):  
Domain Wall ◽  
Magnetic Anisotropy ◽  
Wall Motion ◽  
Perpendicular Magnetic Anisotropy ◽  
Domain Wall Motion ◽  
Thermally Activated

scholarly journals Thermally Activated Ferromagnetic Domain Wall Motion

1960 ◽  
Vol 13 (3) ◽  
pp. 599 ◽  
Keyword(s):  
Domain Wall ◽  
Wall Motion ◽  
Permanent Magnets ◽  
Elementary Theory ◽  
Fine Powder ◽  
Domain Wall Motion ◽  
Absolute Temperature ◽  
Small Scale ◽  
Thermally Activated ◽  
Ferromagnetic Domains

The properties of small ferromagnetic domains are influenced strongly by thermal agitation if the energies involved in transitions between different states of magnetization (rotations and domain wall movements) are only a few times kT (k being Boltzmann's constant and T the absolute temperature). The study of such small-scale magnetic phenomena, now known as "micromagnetics" (see, for example, Brown 1959a), has developed rapidly in recent years in response to commercial interests in fine powder permanent magnets and thin film memory cores. The possibility of observing directly thermally induced domain wall movements is therefore a matter of some interest. It appears that Olmen and Mitchell (1959) have made such an observation, although they did not specifically claim to have done so. The purpose of this note is to present an elementary theory of thermally activated domain wall motion and to show that the results reported by Ohnen and Mitchell are in agreement with it.

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