Distinct Universality Classes of Domain Wall Roughness in Two-Dimensional<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Pt</mml:mi><mml:mo>/</mml:mo><mml:mi>Co</mml:mi><mml:mo>/</mml:mo><mml:mi>Pt</mml:mi></mml:math>Films

Moon, Kyoung‐Woong; Kim, Duck-Ho; Yoo, Seong Il; Cho, Cheong-Gu; Hwang, Sungmin; Kahng, B.; Min, Byoung‐Chul; Shin, Kyung-Ho; Choe, Sung-Bong

doi:10.1103/physrevlett.110.107203

Cited by 47 publications

(49 citation statements)

References 26 publications

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“…Experiments were mainly performed on a Pt/Co/Pt ultrathin ferromagnetic film, a prototypical system which has been the focus of many studies of DW motion [1,2,4,5,[30][31][32][33]. The studied sample was a Pt(4.5 nm)/Co(0.7 nm)/Pt(3.5 nm) thin film, with the thickness of each layer indicated in parenthesis.…”

Section: Discussionmentioning

confidence: 99%

Intermittent collective dynamics of domain walls in the creep regime

et al. 2018

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We study the ultraslow domain-wall motion in ferromagnetic thin films driven by a weak magnetic field. Using time-resolved magneto-optical Kerr effect microscopy, we access to the statistics of the intermittent thermally activated domain-wall jumps between deep metastable states. Our observations are consistent with the existence of creep avalanches: roughly independent clusters with broad size and ignition waiting-time distributions, each one composed by a large number of spatiotemporally correlated thermally activated elementary events. Moreover, we evidence that the large-scale geometry of domain walls is better described by depinning rather than equilibrium universal exponents.

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Section: Discussionmentioning

confidence: 99%

Intermittent collective dynamics of domain walls in the creep regime

et al. 2018

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“…The field value and time scale fix the regime of DW motion. On the one hand, applying low fields for long times gives access to the creep regime [17], which has been studied in particular in ultrathin films with perpendicular magnetization [17][18][19] and recently in asymmetric samples [6,7]. In this regime, the DW energy (surface tension) plays a key role, and the intrinsic magnetization dynamics (damped precession around the effective field) is not important.…”

Section: Introductionmentioning

confidence: 99%

Domain wall dynamics in ultrathin Pt/Co/AlOx microstrips under large combined magnetic fields

et al. 2016

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International audienceThe dynamics of magnetic domain walls in ultrathin strip-patterned Pt/Co/AlOx samples with perpendicular easy axis has been studied experimentally under an easy-axis field, superposed to a hard-axis field oriented along the strip. The easy-axis field is large so that the domain walls move well beyond the creep regime. A chiral effect is observed where the domain wall velocity shows a monotonous and surprisingly large variation with an in-plane field. A micromagnetic analysis, combining analytic, one-dimensional, and two-dimensional simulations with structural disorder, shows that this behavior can be reproduced with a Dzyaloshinskii-Moriya interaction of the interfacial type, with due consideration of the dynamics of the tilt degree of freedom of the domain wall. The estimated effective value of this interaction (D≈−2.2mJ/m2 for a 0.6 nm Co thickness) is consistent with values obtained by other techniques. It is also shown, by micromagnetic analysis, that several modes and characteristic times occur in the dynamics of the tilt of such domain walls

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“…The tilt angle of the electromagnet can be controlled from 0 to 90° in 5° steps. To measure the bubblecade speed , a magnetic bubble was initially created by use of the thermomagnetic writing technique 9, 14, 21 . To apply alternating magnetic field, a magnetic field pulse of + H with a duration time is applied with an angle θ and successively, a reversed magnetic field pulses of − H with the same and θ is applied.…”

Section: Methodsmentioning

confidence: 99%

“…Such DW motion has been achieved by the spin-orbit 2–4, 10 or spin-transfer 11–14 torques through injection of the spin-polarized current for realization of the DW-based racetrack memory 4, 6 . Fairly recently, Moon et al .…”

Section: Introductionmentioning

confidence: 99%

Optimal angle of magnetic field for magnetic bubblecade motion

Kim

Moon

Yoo

et al. 2017

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Unidirectional motion of magnetic structures such as the magnetic domain and domain walls is a key concept underlying next-generation memory and logic devices. As a potential candidate of such unidirectional motion, it has been recently demonstrated that the magnetic bubblecade—the coherent unidirectional motion of magnetic bubbles—can be generated by applying an alternating magnetic field. Here we report the optimal configuration of applied magnetic field for the magnetic bubblecade. The tilted alternating magnetic field induces asymmetric expansion and shrinkage of the magnetic bubbles under the influence of the Dzyaloshinskii-Moriya interaction, resulting in continuous shift of the bubbles in time. By examining the magnetic bubblecade in Pt/Co/Pt films, we find that the bubblecade speed is sensitive to the tilt angle with a maximum at an angle, which can be explained well by a simple analytical form within the context of the domain-wall creep theory. A simplified analytic formula for the angle for maximum speed is then given as a function of the amplitude of the alternating magnetic field. The present results provide a useful guideline of optimal design for magnetic bubblecade memory and logic devices.

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Distinct Universality Classes of Domain Wall Roughness in Two-DimensionalPt/Co/PtFilms

Cited by 47 publications

References 26 publications

Intermittent collective dynamics of domain walls in the creep regime

Intermittent collective dynamics of domain walls in the creep regime

Domain wall dynamics in ultrathin Pt/Co/AlOx microstrips under large combined magnetic fields

Optimal angle of magnetic field for magnetic bubblecade motion

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