Micromagnetic properties and domain dynamics of CoPt thin films

Kleinefeld, Th.; Valentin, J.-P.; Weller, D.

doi:10.1016/0304-8853(95)00225-1

Cited by 11 publications

(16 citation statements)

References 5 publications

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“…Correspondingly, characteristic differences for the hysteresis loops have been found. Similar results have been achieved by simulations of a micromagnetic model using zero temperature dynamics [3,4] and Monte Carlo methods respectively [5].…”

Section: Introductionsupporting

confidence: 76%

“…1, with the corresponding experimental hysteresis loop for room temperature, see Ref. [3,4]. The qualitative agreement is very good.…”

Section: Hysteresis and The Reversal Mechanismsupporting

confidence: 56%

“…Which of these mechanisms dominates a reversal process depends on the interplay of the different interaction forces between domains with different magnetic orientation. In recent experiments on Co 28 Pt 72 alloy films [3,4] a crossover from magnetisation reversal dominated by domain growth to a reversal dominated by a continuous nucleation of domains was found depending on the film thickness which was varied from 10nm to 30nm. Correspondingly, characteristic differences for the hysteresis loops have been found.…”

Section: Introductionmentioning

confidence: 98%

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Domain dynamics of magnetic films with perpendicular anisotropy

Nowak¹,

Heimel²,

Kleinefeld³

et al. 1997

Phys. Rev. B

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We study the magnetic properties of nanoscale magnetic films with large perpendicular anisotropy comparing polarization microscopy measurements on Co28Pt72 alloy samples based on the magneto-optical Kerr effect with Monte Carlo simulations of a corresponding micromagnetic model. In our model the magnetic film is described in terms of single-domain magnetic grains, interacting via exchange as well as via dipolar forces. Additionally, the model contains an energy barrier which has to be overcome in order to reverse a single cell and a coupling to an external magnetic field. Disorder is taken into account.We focus on the understanding of the dynamics especially the temperature and field dependence of the magnetisation reversal process. The experimental and simulational results for hysteresis, the reversal mechanism, domain configurations during the reversal, and the time dependence of the magnetisation are in very good qualitative agreement. The results for the field and temperature dependence of the domain wall velocity suggest that for thin films the hysteresis can be described as a depinning transition of the domain walls rounded by thermal activation for finite temperatures. 75.60.Ch, 75.60.Ej, 75.40.Mg

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Section: Introductionsupporting

confidence: 76%

“…1, with the corresponding experimental hysteresis loop for room temperature, see Ref. [3,4]. The qualitative agreement is very good.…”

Section: Hysteresis and The Reversal Mechanismsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 98%

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Domain dynamics of magnetic films with perpendicular anisotropy

Nowak¹,

Heimel²,

Kleinefeld³

et al. 1997

Phys. Rev. B

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“…Various CoPt alloys, most notably CoPt 3 , are known 15,16 to exhibit perpendicular magnetization and significant Kerr effects. Various CoPt alloys, most notably CoPt 3 , are known 15,16 to exhibit perpendicular magnetization and significant Kerr effects.…”

Section: Resultsmentioning

confidence: 99%

Reversal behavior in a bimodal magneto-optical medium

Fry¹,

Bennett²,

Torre³

1999

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Quantitative magneto-optic field imaging of recording heads (abstract) Bimodal magnetic behavior, in which Kerr rotation ( K ) and ellipticity (⑀ K ) each exhibit major magneto-optic hysteresis loops with two distinct field-dependent steps, was encountered in a ͑0.3 nm Co/1.2 nm Pt͒ 15 multilayer film with perpendicular magnetization. A model is postulated in which there are two different interacting magnetic entities present in the layered structure of this material, each with a stable perpendicular magnetization state either parallel or antiparallel to the applied field, and which reverse quasi-independently from one another. Due to interactions between the two, the reversals occur at the intrinsic coercivities displaced by an interaction field, H i , whose sign depends upon the magnetization of the other phase. Using major loop and first-order reversal measurements, the intrinsic coercivities, as well as H i , were obtained.

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“…[2][3][4] Although pulsed magnetic fields from lightning have been detected utilizing the magnetization of stones, 5 this letter presents the first application of thin films as a pulsed magnetic field monitor. [2][3][4] Although pulsed magnetic fields from lightning have been detected utilizing the magnetization of stones, 5 this letter presents the first application of thin films as a pulsed magnetic field monitor.…”

mentioning

confidence: 99%