Validation of ΔH(M,ΔM)-technique for identification of switching field distributions in the presence of thermal relaxation

Hovorka, Ondřej; Evans, Richard F. L.; Chantrell, R.W.; Liu, Y.; Dahmen, Karin A.; Berger, Andreas

doi:10.1063/1.3517823

Cited by 10 publications

(4 citation statements)

References 18 publications

(35 reference statements)

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“…In order to further distinguish and quantify the SFD origins, we use the H (M, M) method, which allows for separating the intrinsic SFD from interaction effects. Originally, the method had been developed based on the mean-field model of perpendicular magnetic recording media [16,17] and BPM [16,18,35] and was later generalized beyond the mean-field approximation to be reliable in a broader range of exchange and dipolar coupling values [36][37][38].…”

Section: A Macroscopic Featuresmentioning

confidence: 99%

Reversal mechanism, switching field distribution, and dipolar frustrations in Co/Pt bit pattern media based on auto-assembled anodic alumina hexagonal nanobump arrays

et al. 2014

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Équipe 101 : Nanomagnétisme et électronique de spinInternational audienceWe fabricated a perpendicularly magnetized bit pattern media using a hexagonally close-packed auto-assembled anodic alumina template with 100 nm and 50 nm periods by depositing a Co/Pt multilayer to form an ordered array of ferromagnetic nanodots, so-called nanobumps. We used Hall resistance measurements and magnetic force microscopy to characterize the dot-by-dot magnetization reversal mechanism under applied field. The role of interdot exchange coupling and dipolar coupling are investigated. Then we focus on separating the various origins of switching field distribution (SFD) in this system, namely dipolar interactions, intrinsic anisotropy distribution, and template packing faults. Finally we discuss the influence of triangular dipolar frustrations on the energy stability of demagnetized and half-switched states based on an Ising model, including local exchange coupling. The impact of SFD and lattice defects lines between misoriented ordered domains on the magnetic configurations is studied in detail

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Section: A Macroscopic Featuresmentioning

confidence: 99%

Reversal mechanism, switching field distribution, and dipolar frustrations in Co/Pt bit pattern media based on auto-assembled anodic alumina hexagonal nanobump arrays

et al. 2014

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“…Different experimental techniques are available to separate irreversible switching from reversible magnetization changes. If densely packed in AAO templates, the strong interaction between Ni nanorods requires sophisticated analysis [29,[59][60][61][62][63][64]. In textured hydrogel composites at sufficiently low volume fraction, dipolar fields were found to be negligible and the switching field distribution (SFD) could be obtained from demagnetization remanence measurements [22,54,65].…”

Section: Programming By Irreversible Magnetization Changesmentioning

confidence: 99%

Field-induced deformation of ferromagnetic soft nanocomposites

Birster¹,

Schweitzer²,

Schopphoven³

et al. 2021

J. Phys. D: Appl. Phys.

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Uniaxial ferromagnetic Ni nanorods were prepared by the anodic aluminum oxide (AAO) template method. Reversible magnetization changes, measured perpendicular to the texture axis, were analyzed in terms of the Stoner–Wohlfarth model (SW). Using empirical model parameters, a quantitative and consistent description of the orientation- and field-dependent magnetic torque per particle was achieved. The model was extended (eSW) to take into account the local rotation of the magnetic nanorods in a soft-elastic matrix. The nanorods were characterized regarding their size, using transmission electron microscopy (TEM), their magnetic moment and colloidal volume fraction, determined from static field-dependent optical transmission (SFOT) measurements, and their rotational shape factor, obtained from oscillating field-dependent optical transmission (OFOT). The eSW-model was used in the simulation of simple bending and torsion of thin composite filaments. These simulations were compared with experimental results with the focus on the effect of finite magnetic anisotropy and local elastic rotation on the field-induced deformation of soft nanocomposites. The high sensitivity of thin filaments enabled the investigation of torque-induced deformation at nanorod volume density as low as 10−4 at which particle-particle interactions were negligible. In addition, reprogramming of the magnetic texture by magnetization reversal and the resulting modification in the deformation pattern was investigated.

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“…The focus of recent studies is on perpendicular anisotropy, where the easy direction is perpendicular to the surface of the film. Since the most evident application of magnetic materials is data storage, the most recent efforts are on bit-patterned magnetic films [3][4][5][6][7][8] or granular films [7,[9][10][11], while ours are continuous. In the case where continuous films are studied [8,12], the mechanism of switching is domain wall motion, whereas in our case it is coherent rotation.…”

Section: Introductionmentioning

confidence: 99%

Distribution of switching fields in thin films with uniaxial magnetic anisotropy

Yakovlev¹,

Tay²,

Tay³

et al. 2013

Journal of Magnetism and Magnetic Materials

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Validation of ΔH(M,ΔM)-technique for identification of switching field distributions in the presence of thermal relaxation

Cited by 10 publications

References 18 publications

Reversal mechanism, switching field distribution, and dipolar frustrations in Co/Pt bit pattern media based on auto-assembled anodic alumina hexagonal nanobump arrays

Reversal mechanism, switching field distribution, and dipolar frustrations in Co/Pt bit pattern media based on auto-assembled anodic alumina hexagonal nanobump arrays

Field-induced deformation of ferromagnetic soft nanocomposites

Distribution of switching fields in thin films with uniaxial magnetic anisotropy

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