Co/Pt perpendicular antidot arrays with engineered feature size and magnetic properties fabricated on anodic aluminum oxide templates

Rahman, Masudur; Shams, N.N.; Lai, Chih‐Huang; Fidler, J.; Suess, Dieter

doi:10.1103/physrevb.81.014418

Cited by 68 publications

(51 citation statements)

References 31 publications

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“…The rather square shape IP loops (high M r /M s ) shows that the magnetization easy axis (low H c ) is in-plane, while the magnetization hard axis (high H c ) is along the out-of-plane direction. This result is consistent with previous studies on similar films [44][45][46][47] , and can be attributed to the confined out-of-plane direction that impedes the nucleation and motion of domain walls and forces the magnetic moments to reverse through rotation. The OP H e values of all samples are higher than for the IP case, suggesting that an effective magnetic anisotropy energy (E A ) larger than the interface exchange energy (E int ) can be achieved in the OP direction rather than in the IP direction 33,48 .…”

Section: Resultssupporting

confidence: 82%

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: 82%

Magneto-Plasmons in Periodic Nanoporous Structures

Song

Yin

Wang

et al. 2014

Sci Rep

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“…[4][5][6][7][8] Magnetotransport and hysteresis properties have been investigated in detail, considering different materials and analyzing the role of lattice configuration, hole shape, and geometrical parameters, such as the hole size and the interhole distance. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] Magnetic domain structures arising in antidot arrays have been experimentally observed by means of magnetic force microscopy (MFM), Lorentz microscopy, X-ray photoemission electron microscopy, and magnetooptic Kerr effect measurements. [22][23][24][25][26][27][28][29] The patterning introduces a spatially dependent shape anisotropy that allows the nucleation and propagation of domain walls, influencing in this way the reversal mechanism, the remanent magnetization, and the coercive field.…”

Section: Introductionmentioning

confidence: 99%

“…[22][23][24][25][26][27][28][29] The patterning introduces a spatially dependent shape anisotropy that allows the nucleation and propagation of domain walls, influencing in this way the reversal mechanism, the remanent magnetization, and the coercive field. [9][10][11][12][13][14][15][16] A fourfold anisotropy has been found in square-lattice geometries, while hexagonal and honeycomb configurations exhibit a sixfold symmetry. 9 Particular attention has been devoted to the nucleation and propagation of discrete domain chains, to explore the possibility of controlling domain walls with well-defined magnetic configurations.…”

Section: Introductionmentioning

confidence: 99%

A micromagnetic study of the reversal mechanism in permalloy antidot arrays

Wiele

Manzin

Vansteenkiste

et al. 2012

Journal of Applied Physics

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Spin-transfer-torque switching in spin valve structures with perpendicular, canted, and in-plane magnetic anisotropies J. Appl. Phys. 111, 07C913 (2012) Micromagnetic analysis of the magnetization dynamics driven by the Oersted field in permalloy nanorings J. Appl. Phys. 111, 07D103 (2012) Magnetization states and switching in narrow-gapped ferromagnetic nanorings AIP Advances 2, 012136 (2012) Normal modes of coupled vortex gyration in two spatially separated magnetic nanodisks J. Appl. Phys. 110, 113903 (2011) Coercivity control in finite arrays of magnetic particles J. Appl. Phys. 110, 103908 (2011) Additional information on J. Appl. Phys. A numerical analysis is focused on the influence of patterning and finite-size effects on the hysteresis properties and magnetization reversal of permalloy antidot films with square lattice and square holes. Simulations are performed by solving the Landau-Lifshitz equation. The aim is to explain the relationships between the shape of the hysteresis loop and the different stages of the reversal process. In particular, the switching mechanism is characterized by the nucleation of domain chains that destroy the periodic symmetry in the magnetization present when infinite periodicity is considered. This behavior is strongly influenced by the demagnetizing effects arising both at the film boundaries and at the hole edges. V C 2012 American Institute of Physics.

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“…Among the ways to produce nanostructured films, anodized alumina templates (AAO) have emerged as a low cost, simple and effective method to obtain large areas of nanopatterns. 6,11 When a material is deposited on top of AAO membranes with pores of different diameter a continuous film with an arrangement of holes is obtained. However, if we use the bottom side of AAO membranes (barrier layer) we can obtain nanohills or nanodomes films, where the last one shows different magnetic reversion mechanisms and can be interesting in basic and applied research in magnetism.…”

Section: Introductionmentioning

confidence: 99%

“…4,5 The research and potential applications of nanopatterned PMA films is still more exciting, since the patterns can have length scales similar to the domain-wall widths and can be tailored to limit the domain-wall propagation, [6][7][8] and to observe new magnetic phenomena as magnetic skyrmions. 9 Methods for fabrication of nanopaterned PMA films include lithography or self-assembling block copolymers.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Hall effect in Co/Pd multilayered nanodomes with perpendicular anisotropy

et al. 2017

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In this work, multilayers of Co/Pd with out of plane anisotropy have been deposited on the bottom of porous alumina membranes, forming nanodomes films with 100 and 200 nm diameter. The magnetization reversal of the multilayers is investigated by magnetization curves, extraordinary Hall effect and magnetic force microscopy (MFM) experiments. The results show that as the pore diameter increase, a larger hall resistivity is obtained, compared with the continuous film.

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Co/Pt perpendicular antidot arrays with engineered feature size and magnetic properties fabricated on anodic aluminum oxide templates

Cited by 68 publications

References 31 publications

Magneto-Plasmons in Periodic Nanoporous Structures

Magneto-Plasmons in Periodic Nanoporous Structures

A micromagnetic study of the reversal mechanism in permalloy antidot arrays

Enhanced Hall effect in Co/Pd multilayered nanodomes with perpendicular anisotropy

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