Tunable exchange bias-like effect in patterned hard-soft two-dimensional lateral composites with perpendicular magnetic anisotropy

Hierro-Rodríguez, A.; Teixeira, J. M.; Vélez, María; Álvarez-Prado, L. M.; Martín, José Ignacio; Alameda, J. M.

doi:10.1063/1.4895771

Cited by 7 publications

(5 citation statements)

References 31 publications

(43 reference statements)

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“…This field is always aligned with the anti-dots layer EA The obtained loops show a clear bias field shift that can be tuned from positive to negative values depending on the dots' saturation field sense along the antidots layer EA No bias field shift is observed when the saturating field is applied perpendicular to the anti-dots layer anisotropy direction. These results, observed in a pure magnetostatically coupled hybrid system, are in agreement with previous ones obtained in exchange-coupled hard-soft 2D microstructures [20].…”

Section: Hybrid (Hard/soft) Systemsupporting

confidence: 92%

“…In this case, it presents a unidirectional magnetic anisotropy that can be oriented by the last saturating applied magnetic field (see footnote 6). This tunable unidirectional anisotropy is the so-called rotatable anisotropy [20,30,31].…”

Section: Continuous Layers and Isolated Microstructuresmentioning

confidence: 99%

“…In this framework, systems composed of soft and hard magnetic materials allow us to control the magnetization reversal processes in the soft material by changing the magnetization configuration in the harder one [18,19]. As reported recently, hard/soft magnetic composites can constitute the basis for the development of active magnetic devices, where the exchange bias-like effect can be completely controlled (even switched off) by an external agent [20]. This is achieved by using a weak perpendicular magnetic anisotropy (PMA) material, such as amorphous NdCo 5 .…”

Section: Introductionmentioning

confidence: 97%

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Unravelling the tunable exchange bias-like effect in magnetostatically-coupled two dimensional hybrid (hard/soft) composites

Hierro-Rodríguez

Teixeira²,

Rodríguez-Rodríguez

et al. 2015

Nanotechnology

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Hybrid 2D hard-soft composites have been fabricated by combining soft (Co73Si27) and hard (NdCo5) magnetic materials with in-plane and out-of-plane magnetic anisotropies, respectively. They have been microstructured in a square lattice of CoSi anti-dots with NdCo dots within the holes. The magnetic properties of the dots allow us to introduce a magnetostatic stray field that can be controlled in direction and sense by their last saturating magnetic field. The magnetostatic interactions between dot and anti-dot layers induce a completely tunable exchange bias-like shift in the system's hysteresis loops. Two different regimes for this shift are present depending on the lattice parameter of the microstructures. For large parameters, dipolar magnetostatic decay is observed, while for the smaller one, the interaction between the adjacent anti-dot's characteristic closure domain structures enhances the exchange bias-like effect as clarified by micromagnetic simulations.

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Section: Hybrid (Hard/soft) Systemsupporting

confidence: 92%

Section: Continuous Layers and Isolated Microstructuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Unravelling the tunable exchange bias-like effect in magnetostatically-coupled two dimensional hybrid (hard/soft) composites

Hierro-Rodríguez

Teixeira²,

Rodríguez-Rodríguez

et al. 2015

Nanotechnology

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“…26 This compound has previously been prepared in different forms using other techniques. 27,28 A crystal of NdCo 5 with a volume of 0:05 mm 3 was taken from the same batch used for our recent torque magnetometry study. 15 The crystal was loaded into a cylindrical polytetrafluoroethylene sample holder filled with a pressure transmitting medium (Daphne oil) and placed in an easyLab Mcell 10 beryllium-copper piston clamp pressure cell.…”

mentioning

confidence: 99%

Tunability of the spin reorientation transitions with pressure in NdCo5

Kumar

Patrick

Edwards

et al. 2020

Applied Physics Letters

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We present pressure-dependent magnetization measurements carried out in the domain of the spin reorientation transitions (SRTs) of a NdCo 5 single crystal. The application of a hydrostatic pressure leads to a shift in the SRTs to higher temperatures. This shift is found to be very sensitive to pressure, with the SRT temperatures increasing at a rate of 17 K/GPa. To explain the experimental results, we have also performed first-principles calculations of the SRT temperatures for different applied strains, which corroborate the experimental findings. The calculations attribute the pressure dependence of the SRTs to a faster weakening of the Co contribution to the magnetocrystalline anisotropy with pressure compared to the Nd contribution.

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“…12 This stripe pattern is locked in place by rotatable anisotropy and reconfigurable through magnetic history. 11,13 These two properties provide the basis for tunable magnetic devices 14 and have been used for the guided propagation of superconducting vortices in magnetic/superconducting hybrids. 15,16 Stray fields and exchange interactions can be used to imprint complex magnetic textures as bubbles or skyrmions on soft magnetic layers in multilayers combining perpendicular magnetic anisotropy (PMA) and in-plane anisotropy materials.…”

mentioning

confidence: 99%

Deterministic propagation of vortex-antivortex pairs in magnetic trilayers

Hierro-Rodríguez

Quirós

Sorrentino

et al. 2017

Applied Physics Letters

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Thin perpendicular magnetic anisotropy films between two soft ferromagnetic layers have the nuclei for magnetization inversion at the bifurcations of their characteristic stripe domain pattern. The inverted nuclei induce vortex-antivortex pairs in the soft magnetic layers that exhibit a correlated motion extending several μm along the magnetic stripes during magnetization reversal. The sense of motion is completely determined by the topology of the magnetic bifurcations causing vortex-antivortex pairs to propagate in opposite senses depending on their polarities. This is a robust effect that might have practical applications. These findings are based on X-ray microscopy and micromagnetic calculations.

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Tunable exchange bias-like effect in patterned hard-soft two-dimensional lateral composites with perpendicular magnetic anisotropy

Abstract: Articles you may be interested in Effect of magnetic softness in a soft layer on media properties of hard/soft stacked composite perpendicular media

Cited by 7 publications

References 31 publications

Unravelling the tunable exchange bias-like effect in magnetostatically-coupled two dimensional hybrid (hard/soft) composites

Unravelling the tunable exchange bias-like effect in magnetostatically-coupled two dimensional hybrid (hard/soft) composites

Tunability of the spin reorientation transitions with pressure in NdCo5

Deterministic propagation of vortex-antivortex pairs in magnetic trilayers

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