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

Valdés-Bango, F.; Alonso, Francisco; Rodríguez-Rodríguez, G.; Fernández, Laura García; Anillo, A.; Ruiz-Valdepeñas, L.; Navarro, E.; Vicent, J. L.; Vélez, María; Martín, José Ignacio; Alameda, J. M.

doi:10.1063/1.4759276

Cited by 9 publications

(9 citation statements)

References 43 publications

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“…The IP H c and OP H c are increased from 25 Oe to 35 Oe, and from 111 Oe to 122 Oe, respectively. Unlike the reduction of OP H c in the CoFeB film by nanopores, the OP H c is increased in the Ag/CoFeB/ Ag film due to the increased intrinsic OP anisotropy resulting from the increased wall thickness of the pores 53 and Ag layer perpendicular pinning effect, similar to that reported in core-shell NPs 4 . In addition, Ag layers can possibly reduce the local stray fields introduced by magnetic dipoles around the interface planes of pores due to their high conductivity, which also favors an increase in the intrinsic OP magnetic anisotropy (and enhance OP H c ).…”

Section: Resultssupporting

confidence: 61%

Magneto-Plasmons in Periodic Nanoporous Structures

Song

Yin

Wang

et al. 2014

Sci Rep

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We report on ordered nanoporous films exhibiting a unique magneto-plasmon based response, fabricated by nanosphere-assisted physical deposition. This work focuses on multi-layer Ag/CoFeB/Ag films as examples of such structures. Their microstructure dependent magnetic properties, localized surface plasmon resonance (LSPR) and magneto-optical Kerr effect were investigated. The observed effects of nanopores and Ag layers on the magnetic properties indicate the synergistic interaction between nanopores and Ag layers leading to an enhancement of the ferromagnetic character of the CoFeB film. LSPR spectra reveal that the introduction of Ag layers enhances the light transmission in the nanoporous CoFeB films (having pore sizes exceeding the wavelength of light) due to an enhanced interaction of light with surface plasmons. Periodic nanoporous Ag/CoFeB/Ag films covered by Ag capped nanospheres show a much larger extinction than uncovered nanoporous Ag/CoFeB/Ag films. The correlation between the magneto-optical Kerr effect and the nanostructures suggests a field-tunable Kerr effect owing to the magneto-electric coupling between the magnetic layer and the Ag layers, which is enhanced by the nanopores. These hybrid nanostructures are expected to offer potential applications in photovoltaic cells and for magneto-optic sensors.H ybridization of nanostructures has emerged as a new way of realizing multi-functionality and/or improved physical and chemical properties arising from the coupling of constituent materials (e.g. interfacial magneto-electric coupling or IFMEC) [1][2][3][4][5][6][7][8][9][10][11][12][13] . This innovative approach also offers a route for overcoming undesirable compromises between material properties and performance that accompany size reduction in nanotechnology. Examples include increased activity but reduced stability [5][6][7][14][15][16][17][18] , superparamagnetism versus ferromagnetism 3,19 , increased sensitivity but reduced intensity 11,[20][21][22] , and enhanced magneto-optical effect but increased energy loss 23,24 . Applications of new types of multi-functional nanoparticles (NPs) based on hybridization require control over the mismatch among different components and a good understanding of the interface-coupling and proximity effects in the constituent parts 3,5,7,8,25 . It is also essential to develop controlled processes for large scale fabrication of well-defined nanoentities with long-term stability in desired media 10,[26][27][28][29][30][31][32][33][34][35] .For hybrid nanomaterials with magnetic components, both the magnetic properties and dielectric constants can be tuned by IFMEC effects, leading to enhanced magnetic, electronic, optical and acoustic properties 1,5,23,24 . Recent investigations indicate that active magneto-plasmonic nanomaterials formed by noble metals and magnetic metals can improve the interaction between magnetic field, electric field, electromagnetic waves and the localized surface plasmon resonance (LSPR), leading to applications for efficient switching and t...

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Section: Resultssupporting

confidence: 61%

Magneto-Plasmons in Periodic Nanoporous Structures

Song

Yin

Wang

et al. 2014

Sci Rep

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“…wPMA honeycomb lattices were fabricated with a similar procedure with the deposition of a 60 nm thick layer of NdCo 5 alloy from co-sputtering of two individual Nd and Co targets [28]. Sample thickness is chosen to be above the critical thickness for nucleation of stripe domains in this material, which is of the order of 45 nm at room temperature [42]. Sample was rotated continuously during the deposit in order to preclude in-plane anisotropies.…”

Section: Methodsmentioning

confidence: 99%

Topological defects in weak perpendicular magnetic anisotropy NdCo honeycomb lattices

et al. 2018

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Domain configuration has been studied by magnetic force microscopy and micromagnetic simulations in NdCo honeycomb lattices in comparison with similar patterned structures made of polycrystalline Co. The change in material anisotropy from in-plane to weak perpendicular magnetic anisotropy (wPMA) modifies the basic domain structure and relevant topological defects in the magnetization in each case: from in-plane domains, vortices, antivortices and half vortices in Co lattices to parallel stripe patterns with dislocations in NdCo samples with large enough thickness. A characteristic feature of wPMA materials is the possibility to drive the system from in-plane to stripe pattern configuration playing with sample thickness (during growth) or with magnetic anisotropy (as a function of temperature). It has allowed us to observe complex magnetic textures within the stripe pattern of NdCo samples imprinted from previous magnetic vortex and antivortex states that nucleate within the honeycomb lattice during the early stages of deposition and, then, become frozen by local rotatable anisotropy as sample thickness increases.

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“…14). These nanostructured templates modify both the magnetic film topography and mechanical strain on a local scale, resulting in a reduction in PMA anisotropy and an enhancement of stripe domain pinning effects, which could be of use to alter the geometry of the imprinted superconducting network in the Nb layer.…”

Section: Methodsmentioning

confidence: 99%

Imprinted labyrinths and percolation in Nd-Co/Nb magnetic/superconducting hybrids

Ruiz-Valdepeñas

Vélez

Valdés-Bango

et al. 2014

Journal of Applied Physics

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Magnetization reversal processes have been studied in hybrid magnetic/superconducting Nd-Co/Nb bilayers by the comparison of out-of-plane magnetic hysteresis loops and superconducting phase diagrams as a function of magnetic layer thickness and of disorder in the magnetic layer induced by a nanostructured copolymer template. A good correlation is found between the regimes corresponding to percolation effects in the superconductor and to the transition from extended to confined superconductivity with the characteristic fields for reverse domain nucleation and fast domain expansion in the magnetic layer, indicating that superconductivity nucleates on the disordered network imprinted on the superconducting layer by the labyrinth domain structure of the magnetic layer. As disorder increases in the magnetic layer, percolation effects disappear from the superconducting transitions in agreement with a more homogeneous magnetization reversal process.

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

Cited by 9 publications

References 43 publications

Magneto-Plasmons in Periodic Nanoporous Structures

Magneto-Plasmons in Periodic Nanoporous Structures

Topological defects in weak perpendicular magnetic anisotropy NdCo honeycomb lattices

Imprinted labyrinths and percolation in Nd-Co/Nb magnetic/superconducting hybrids

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