Magneto-optical transverse Kerr effect in multilayers

Dehesa-Martínez, C.; Blanco-Gutiérrez, L.; Vélez, María; Dı́az, J.; Álvarez-Prado, L. M.; Alameda, J. M.

doi:10.1103/physrevb.64.024417

Cited by 42 publications

(25 citation statements)

References 51 publications

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“…MOTKE is particularly useful for two reasons: the short penetration depth of visible light in these alloys (around 40 nm, i.e. shorter than each layer thickness [21]) and the sensitivity of the Kerr signal in the visible range only to the magnetic behavior of the Co sublattice and not to the Gd moments contribution [22]. Thus, MOTKE hysteresis loops provide the magnetic behavior of only the Co sublattice in either the top or bottom Gd-Co layer depending on whether the incident light enters the sample from the top or bottom surface [18].…”

Section: Methodsmentioning

confidence: 99%

Tuning interfacial domain walls in GdCo/Gd/GdCo′ spring magnets

et al. 2015

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Spring magnets based on GdCo multilayers have been prepared to study the nucleation and evolution of interfacial domain walls (iDW) depending on layer composition and interlayer coupling. GdCo alloy compositions in each layer were chosen so that their net magnetization aligns either with the Gd (Gd 35 Co 65 ) or Co (Gd 11 Co 89 ) sublattices. This condition forces an antiparallel arrangement of the layers' net magnetization and leads to nucleation of iDWs above critical magnetic fields whose values are dictated by the interplay between Zeeman and exchange energies. By combining x-ray resonant magnetic scattering with Kerr magnetometry we provide detailed insight into the nucleation and spatial profile of the iDWs. For strong coupling (GdCo/GdCo' bilayer), iDWs are centered at the interface but with asymmetric width depending on each layer magnetization. When interlayer coupling is weakened by introducing a thin Gd interlayer, the exchange spring effect becomes restricted to a lower temperature and field range than observed in the bilayer structure. Due to the ferromagnetic alignment between the high magnetization Gd 35 Co 65 layer and the Gd interlayer, the iDW shrinks and moves into the lower exchange Gd interlayer causing a reduction of interfacial domain wall energy.2

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Section: Methodsmentioning

confidence: 99%

Tuning interfacial domain walls in GdCo/Gd/GdCo′ spring magnets

et al. 2015

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“…The reflected light was detected with a photodiode and the changes in reflectivity were recorded as a function of H in order to obtain the in-plane magnetization hysteresis loops. 32 Low temperature extraordinary Hall effect (EHE) has been measured in a He cryostat with a 90 kOe electromagnet in order to obtain the out-of-plane hysteresis loops of the PMA samples. 33,34 Magnetic domain structure has been characterized at room temperature by magnetic force microscopy (MFM) using a Nanotec TM system equipped with a 1 kOe electromagnet that allows us to apply in-plane variable fields.…”

Section: Fabrication a Nanostructured Template Fabricationmentioning

confidence: 99%

Perpendicular magnetic anisotropy in Nd-Co alloy films nanostructured by di-block copolymer templates

Valdés-Bango

Alonso

Rodríguez-Rodríguez

et al. 2012

Journal of Applied Physics

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Nd-Co amorphous magnetic films with perpendicular magnetic anisotropy have been grown on nanostructured templates prepared with self-organized di-block poly(styrene)-blockpoly(4-vinylpyridine) copolymer layers with a periodic structure of 60 nm spaced pores. These templates modify both the magnetic film topography and mechanical strain on a local scale. The effect of these structural changes is particularly noticeable in the low thickness range of the magnetic films where the transition from in-plane to out-of plane magnetization takes place. The Nd-Co films grown on the copolymer template present lower perpendicular magnetic anisotropy and, also, stronger stripe domain pinning effects in comparison with reference films grown on flat Si substrates. V C 2012 American Institute of Physics.

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“…Figure 1(c) shows the resulting hysteresis loops in the control continuous layers sputter deposited at the same time that the 2D micro-composite, measured by transverse magneto-optical Kerr effect (T-MOKE), 26 where the applied magnetic field direction is parallel to the in-plane E.A. Depending on the thickness of the magnetic layer, the magnetic hysteresis loop of the system can change from a clear transcritical loop (a reduced in-plane remanent magnetization followed by an almost linear reversible region as the magnetization approaches to saturation) with remarkable PMA (Nb protected layer), to an in-plane uniaxial loop (etched layer) with a reduction in coercivity from 300 Oe to 50 Oe in agreement with previous results.…”

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confidence: 99%