Engineering irreversibility of exchange springs in antiferromagnetic DyFe<sub>2</sub>/YFe<sub>2</sub>superlattices

Wang, D.; Buckingham, A.R.; Bowden, G. J.; Ward, R. C. C.; Groot, P.A.J. de

doi:10.1088/2053-1591/1/3/036110

Cited by 4 publications

(4 citation statements)

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“…6 These conclusions are in agreement with the OOMMF calculations of Ref. [19] However, it should be noted that the latter used anisotropy parameters appropriate for 150 K instead of 100 K. This choice is questionable given that the direction of easy magnetization starts to move away from the easy [001] axis at temperatures above 100 K [13]. The latter also found hysteresis in partial loops obtained using bulk magnetometry but had to rely on OOMMF simulations for interpretation.…”

Section: Modeling Results For a Field Directed Along An In-plane supporting

confidence: 73%

“…[19]). Of course, this involves summing all the contributions from the Dy, Fe, and Y moments involved.…”

Section: A Bulk Magnetizationmentioning

confidence: 99%

“…For 094403-4 example, using the micromagnetic simulation code OOMMF [20] estimates of the switching fields in the Dy-doped multilayer are at least an order of magnitude larger than the experimental values (see the discussion in Ref. [19]). To some extent, these overestimates can be corrected by calculating both the switching and the energy crossover fields and estimating the actual switching field by taking their average [14].…”

Section: Micromagnetic Modelingmentioning

confidence: 99%

“…The exchange springs are no longer reversible and give rise to further steps in the hysteresis loops. This situation has also been examined by Wang et al [19] using bulk magnetic measurements complemented by magnetic modeling using an object-oriented micromagnetic framework (OOMMF) [20].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic reversal in Dy-dopedDyFe2/YFe2superlattice films

et al. 2015

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Reversible magnetic exchange springs can be formed in the magnetically soft YFe 2 layers of epitaxial DyFe 2 /YFe 2 multilayer films. Here we show that the insertion of just two monolayers of DyFe 2 , placed directly in the middle of the YFe 2 layers, brings about substantial changes. Results are presented for a Dy-doped (110)-oriented [DyFe 2 (60Å)/YFe 2 (120Å)/DyFe 2 (8Å)/YFe 2 (120Å)] 15 multilayer film, measured at 100 K in fields of up to ±10 T. Using bulk magnetometry, micromagnetic modeling, and Dy-specific x-ray magnetic circular dichroism, it is shown that Dy doping substantially increases the number of spin states available to the system. Altogether 12 distinct spring states are identified which bring additional complexity to the magnetic reversal process. In particular, the exchange springs are no longer reversible, exhibiting magnetic exchange-spring collapse. Full and partial magnetic loops are presented for fields applied along the in-plane easy [001] axis and the in-plane hard [110] axis. In particular, it is demonstrated that exchange-spring collapse is sharpest when the field is applied along a hard in-plane [110] axis.

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Section: Modeling Results For a Field Directed Along An In-plane supporting

confidence: 73%

“…[19]). Of course, this involves summing all the contributions from the Dy, Fe, and Y moments involved.…”

Section: A Bulk Magnetizationmentioning

confidence: 99%