Dynamics of Magnetization Reversal: From Continuous to Patterned Ferromagnetic Films

Ferré, J.

doi:10.1007/3-540-40907-6_5

Cited by 69 publications

(57 citation statements)

References 88 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dynamics of magnetic domain walls (DWs) driven by magnetic field [1][2][3][4][5][6][7][8][9][10][11] or electric current is often dictated by interactions with defects.…”

Section: Introductionmentioning

confidence: 99%

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

Emori

Umachi

Bono

et al. 2015

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

Thermally activated domain-wall (DW) motion driven by magnetic field and electric current is investigated experimentally in out-of-plane magnetized Pt(Co/Pt) 3 multilayers. We directly extract the thermal activation energy barrier for DW motion and observe the dynamic regimes of creep, depinning, and viscous flow. Further analysis reveals that the activation energy must be corrected with a factor dependent on the Curie temperature, and we derive a generalized Arrhenius-like equation governing thermally activated motion. By using this generalized equation, we quantify the efficiency of currentinduced spin torque in assisting DW motion. Current produces no effect aside from Joule heating in the multilayer with 7-Å thick Co layers, whereas it generates a finite spin torque on DWs in the multilayer with atomically thin 3-Å Co layers. These findings suggest that conventional spin-transfer torques from in-plane spin-polarized current do not drive DWs in ultrathin Co/Pt multilayers.

show abstract

“…The dynamics of magnetic domain walls (DWs) driven by magnetic field [1][2][3][4][5][6][7][8][9][10][11] or electric current is often dictated by interactions with defects.…”

Section: Introductionmentioning

confidence: 99%

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

Emori

Umachi

Bono

et al. 2015

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

show abstract

“…in which the first term is the Zeeman energy, and other terms describe the energy due to magnetic anisotropy, with the corresponding anisotropy parameters [1][2][3][4][5][6]. The interaction Hamiltonian is caused by dipole spin interactionŝ…”

Section: Realistic Model Of Nanocluster Systemmentioning

confidence: 99%

“…Magnetic nanoclusters are the objects enjoying rich and interesting properties with a variety of applications, as can be inferred form the review articles [1][2][3][4][5]. For example, they are used in magnetic chemistry as catalysts; in biomedical imaging for magnetic reading by magnetometers that measure the magnetic field change induced by nanoclusters; in medical treatment by employing alternating magnetic fields forcing the oscillation of the nanocluster magnetic moment that produces heat destroying ill cells or bacteria; in genetic engineering by attaching a nanocluster to a particular piece of the molecule and then removing it together with this piece; in waste cleaning by stacking nanoclusters to waste and then removing them together with waste; in information storage, processing, and quantum computing; and so on [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimal conditions for magnetization reversal of nanocluster assemblies with random properties

Kharebov

Henner

Yukalov

2013

Journal of Applied Physics

View full text Add to dashboard Cite

Magnetization dynamics in the system of magnetic nanoclusters with randomly distributed properties are studied by means of computer simulations. The main attention is paid to the possibility of coherent magnetization reversal from a strongly nonequilibrium state with a mean cluster magnetization directed opposite to an external magnetic field. Magnetic nanoclusters are known to be characterized by large magnetic anisotropy and strong dipole interactions. It is also impossible to produce a number of nanoclusters with identical properties. As a result, any realistic system of nanoclusters is composed of the clusters with randomly varying anisotropies, effective spins, and dipole interactions. Despite this randomness, it is possible to find conditions when the cluster spins move coherently and display fast magnetization reversal due to the feedback action of resonator. By analyzing the influence of different cluster parameters, we find their optimal values providing fast magnetization reversal.

show abstract

“…α = 1 is often found in thin films when domain-wall propagation events determine coercivity, see Ref. [138] for a review. Finally notice that deviations from these simple laws are observed when the dynamics are probed over many orders of magnitude.…”

Section: Thermally Activated Magnetization Reversalmentioning

confidence: 99%

Magnetism in reduced dimensions

Fruchart

Thiaville

2005

Comptes Rendus. Physique

View full text Add to dashboard Cite

We propose a short overview of a few selected issues of magnetism in reduced dimensions, which are the most relevant to set the background for more specialized contributions to the present Special Issue. Magnetic anisotropy in reduced dimensions is discussed, on a theoretical basis, then with experimental reports and views from surface to single-atom anisotropy. Then conventional magnetization states are reviewed, including macrospins, single domains, multidomains, and domain walls in stripes. Dipolar coupling is examined for lateral interactions in arrays, and for interlayer interactions in films and dots. Finally thermally-assisted magnetization reversal and superparamagnetism are presented. For each topic we sought a balance between well established knowledge and recent developments.To cite this article: O. Fruchart, A. Thiaville, C. R. Physique X (y) (2005). RésuméNous proposons un panorama de quelques aspects du magnétisme en dimensions réduites, appropriés comme toile de fond pour les articles plus spécialisés de ce numéro spécial. L'anisotropie magnétique en dimensions réduites est discutée, sur le plan théorique, puis appuyée par des exemples, allant des surfaces aux atomes individuels. Les configurations d'aimantation les plus courantes sont ensuite décrites : macrospins, monodomaines, multidomaines, parois dans des bandes. Les couplages magnétiques, essentiellement dipolaires, sont décrit pour des réseaux et pour des bi-couches. Enfin nous présentons les effets de l'activation thermique, de la baisse de coercitivité jusqu'au superparamagnétisme. Pour chaque aspect nous avons recherché unéquilibre entre résultatsétablis et développements récents.Pour citer cet article : O. Fruchart, A. Thiaville, C. R. Physique X (y) (2005).

show abstract

Dynamics of Magnetization Reversal: From Continuous to Patterned Ferromagnetic Films

Cited by 69 publications

References 88 publications

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

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

Optimal conditions for magnetization reversal of nanocluster assemblies with random properties

Magnetism in reduced dimensions

Contact Info

Product

Resources

About