Observation of Unequal Activation Volumes of Wall-Motion and Nucleation Processes in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Co</mml:mi><mml:mi>/</mml:mi><mml:mi>Pd</mml:mi></mml:math>Multilayers

Choe, Sug–Bong; Shin, Sung‐Chul

doi:10.1103/physrevlett.86.532

Cited by 50 publications

(35 citation statements)

References 25 publications

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“…When an applied field is lower than the coercivity field, magnetization reversal takes place by thermal activation of both nucleation and domain wall-motion processes. An exponential behavior occurs in this regime [1,2]. When an applied field is larger than the coercivity field, magnetization reversal is mainly carried out by viscous domain-wall motion, where the domain wall velocity varies linearly with an applied field [3,4].…”

Section: Introductionmentioning

confidence: 99%

Power-law scaling behavior in Barkhausen avalanches of ferromagnetic thin films

Shin

Ryu

Kim

et al. 2007

Journal of Magnetism and Magnetic Materials

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Section: Introductionmentioning

confidence: 99%

Power-law scaling behavior in Barkhausen avalanches of ferromagnetic thin films

Shin

Ryu

Kim

et al. 2007

Journal of Magnetism and Magnetic Materials

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“…As seen in figure 4, τ exponentially decreases with increasing H , for thick films with t Fe = 50 and 60 nm. Such a phenomenon can be explained by a thermally activated DW creep mechanism [27][28][29][30][31]. When the DW creep mechanism is dominant, τ is given by the following:…”

Section: Resultsmentioning

confidence: 99%

Reduced stochasticity in domain wall motion with increasing pinning density in thin Fe films

et al. 2011

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“…The relation between D f and log (V/R) can be expressed as D f ~ (E W -E N ) + C, where C is a constant related with Barkhausen volume or minimum size of activated domain [15]. With this assumption, the increased number of defects can be considered to make the E N lower and the E W higher, since the defect can be an initial site for domain nucleation as well as a damping barrier for wall propagation.…”

Section: Discussionmentioning

confidence: 99%

Fractal analysis of time‐resolved magnetic domain patterns in Co/Pd multilayer with varying number of repeats

Kim¹,

Cho²,

Choe³

et al. 2004

Physica Status Solidi (b)

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We investigate the fractal behavior of magnetic domain together with analysis of dynamic reversal behavior in Co/Pd multilayer films prepared with different number of repeats n. We utilize a novel magnetooptical microscope magnetometer technique to visualize the time-resolved domain evolution patterns in these films. Quantitative analysis of the time-resolved domain evolution patterns allows us to determine the fractal dimension D f and the reversal ratio V/R depending on n, where V/R represents the counterbalance between the wall-motion speed V and the nucleation rate R. As n increases, domain shape becomes more ragged and complex and thus, D f increases. Interestingly enough, the change in D f clearly seems to be coupled to the change in V/R with varying n, which implies that the correlation between D f and V/R is mediated via the distributed defects.1 Introduction Understanding the shape of magnetic domain and domain dynamics during magnetization reversal in ferromagnetic nanothin films continues to be an intriguing issue in magnetism, greatly motivated by recent technological interest for upcoming magnetoelectric technology such as spintronics and quantum computing as well as for ultrahigh density magnetic and magneto-optical recording [1,2]. To meet the technological interest, it is so vital to understand domain properties, since the magnetic information is stored and controlled via the formation and the reversal of the domain. The size, irregularity, and stability of the written domain will affect the performance of the real magnetic devices. Recently, it has been reported that the detailed shape and the reversal behavior of the magnetic domain is closely correlated with varying the Co sublayer thickness in Co/Pd multilayers [3], where the fractal dimension D f characterizing the shape of the domain has been found to be inversely related to the reversal parameter V/R representing the counterbalance between the wall-motion speed V and the nucleation rate R of magnetic domain [4]. However, systematic investigation on the correlation between the shape and the reversal behavior of magnetic domain in the real ferromagnetic films are still lacking.Domain properties in the real films cannot be fully explained without considering the defect distributed in the film. Numerous efforts have been devoted to correlate the defect to the domain properties. It has been known that distributed defect may leads the motion of domain wall to be glassy creeping dominated by defect [5] or to be propagating with a deroughened shape competing with defect [6]. In this sense, it is not surprising to notice that there have been wide varieties of results reporting different and, in some cases, controversial domain properties depending on detailed fabrication conditions even among similar samples [7 -10]. Recently, domain dynamics has been investigated based on thermally activated

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Observation of Unequal Activation Volumes of Wall-Motion and Nucleation Processes inCo/PdMultilayers

Cited by 50 publications

References 25 publications

Power-law scaling behavior in Barkhausen avalanches of ferromagnetic thin films

Power-law scaling behavior in Barkhausen avalanches of ferromagnetic thin films

Reduced stochasticity in domain wall motion with increasing pinning density in thin Fe films

Fractal analysis of time‐resolved magnetic domain patterns in Co/Pd multilayer with varying number of repeats

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