Temperature dependence of the exchange bias properties of ferromagnetic/antiferromagnetic polycrystalline bilayers

Ledue, D.; Maitre, A.; Barbe, Fabrice; Lechevallier, L.

doi:10.1016/j.jmmm.2014.07.021

Cited by 13 publications

(14 citation statements)

References 30 publications

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“…A major advantage is that they can be meshed with relatively standard approaches [26], while their cells being necessarily convex is often a minor limitation for representing polycrystals [29]. Voronoi tessellations, in particular, have been widely used in numerical simulations in the past few years [7,19,20,[30][31][32][33][34][35] but only partially reproduce elementary polycrystal properties such as their grain size distribution [26].…”

Section: Introductionmentioning

confidence: 99%

Optimal polyhedral description of 3D polycrystals: Method and application to statistical and synchrotron X-ray diffraction data

Quey

Renversade

2018

Computer Methods in Applied Mechanics and Engineering

199

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Section: Introductionmentioning

confidence: 99%

Optimal polyhedral description of 3D polycrystals: Method and application to statistical and synchrotron X-ray diffraction data

Quey

Renversade

2018

Computer Methods in Applied Mechanics and Engineering

199

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“…For all samples, when the temperature decreases, the coercive force increases. These facts can be explained in terms of thermal fluctuations model [35], according to which the spin structure at the interfaces becomes more stable, because when temperature is decreased it reduces the thermal-fluctuations energy of AFM atoms and therefore of the AFM-grains.…”

Section: Resultsmentioning

confidence: 99%

Temperature-dependent magnetization reversal in exchange bias NiFe/IrMn/NiFe structures

Gritsenko

Dzhun

Волочаев

et al. 2019

Journal of Magnetism and Magnetic Materials

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We demonstrate the magnetization reversal features in NiFe/IrMn/NiFe thin-film structures with 40% and 75% relative content of Ni in Permalloy in the temperature range from 80 K to 300 K. At the descending branches of the hysteresis loops, the magnetization reversal sequence of the two ferromagnetic layers is found to depend on the type of NiFe alloy. In the samples with 75% relative content of Ni, the bottom ferromagnetic layer reverses prior to the top one. On the contrary, in the samples with 40% of Ni, the top ferromagnetic layer reverses prior to the bottom one. These tendencies of magnetization reversal are preserved in the entire range of temperatures. These distinctions can be explained by the morphological and structural differences of interfaces in the samples based on two types of Permalloy.

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“…The 0-K anisotropy constant for AF grains is taken to be K 0 AF = 4 × 10 5 Jm −3 [29]. The Néel temperature of the AF layer used in the expression of its anisotropy constant [28,30] is T N = 690 K [3]. By contrast, the coupling per unit area, j F−SG , and the effective anisotropy of SG and SG E are unknown.…”

Section: Model and Simulationmentioning

confidence: 99%

“…Details of Monte Carlo simulations are given in Refs. [22,30]. It is worth noting that three regimes of grains in the AF layer in contact with the F layer should be differentiated according to their T B .…”

Section: Model and Simulationmentioning

confidence: 99%

Influence of finite-size and edge effects on the exchange-bias properties of ferromagnetic/antiferromagnetic nanodots: Granular Monte Carlo investigation

et al. 2019

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In this paper, we investigate exchange-biased square nanodots whose lateral sizes range between 130 and 500 nm, in comparison with continuous films by kinetic Monte Carlo simulations. We use a granular model which takes into account disordered interfacial phases by considering less stable magnetic grains at the interface in the antiferromagnetic (AF) layer. We further model the effect of the nanofabrication process by considering grains with reduced surfaces at the edges, due to grain cutting. Since less stable grains at the nanodot edges in the AF layer have been experimentally evidenced, we assumed a weaker anisotropy for the grains which are in the AF layer at the dot edges. Our results evidence two different mechanisms of the ferromagnetic (F) layer reversal depending on the magnitude of the coupling between F grains. In the weak coupling regime relative to the anisotropy, the exchange field is independent of the coupling and no variability from one nanodot to another is observed. By contrast, in the strong coupling regime, the exchange field depends on the coupling and it shows a high variability from one nanodot to another. Our model also well explain some experimental features observed in NiFe/IrMn nanodots (for various lateral sizes) and continuous films, at various measurement temperatures and various AF thicknesses. Finally, our model explains a long lasting issue about why the exchange field in nanodots can be either smaller or larger than in continuous films.

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Temperature dependence of the exchange bias properties of ferromagnetic/antiferromagnetic polycrystalline bilayers

Cited by 13 publications

References 30 publications

Optimal polyhedral description of 3D polycrystals: Method and application to statistical and synchrotron X-ray diffraction data

Optimal polyhedral description of 3D polycrystals: Method and application to statistical and synchrotron X-ray diffraction data

Temperature-dependent magnetization reversal in exchange bias NiFe/IrMn/NiFe structures

Influence of finite-size and edge effects on the exchange-bias properties of ferromagnetic/antiferromagnetic nanodots: Granular Monte Carlo investigation

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