Ordered Ni nanohole arrays with engineered geometrical aspects and magnetic anisotropy

Navas, D.; Hernández‐Vélez, M.; Vázquez, M.; Lee, W.; Nielsch, Kornelius

doi:10.1063/1.2737373

Cited by 61 publications

(53 citation statements)

References 26 publications

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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%

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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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Section: Introductionmentioning

confidence: 99%

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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“…4 Note that the diameter and the lattice constant are similar to those of Ni nanowires embedded in Al 2 O 3 studied previously, 15,16 so allowing a direct comparison. Therefore, we compare the magneto-optic behavior of three different samples: ͑a͒ Ni membrane with d = 45 nm and a = 90 nm, ͑b͒ Ni nanowires array with very close geometrical parameters ͑d = 40 nm and a = 105 nm͒, and ͑c͒ Ni bulk.…”

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confidence: 70%

“…[1][2][3][4][5][6] Their magnetic properties are strongly influenced by the precise geometry of the nanostructure, namely the pore diameter and the interpore distance since these parameters control the nucleation and movement of domain walls as well as induce locally distributed magnetic anisotropies absent in unpatterned films. 7,8 From an applied viewpoint, ferromagnetic membranes can be used for developing data storage media based on domain wall structures as well as advanced sensing devices.…”

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confidence: 99%

Plasmon-enhanced magneto-optical activity in ferromagnetic membranes

González-Díaz¹,

García-Martín²,

García‐Martín³

et al. 2009

Applied Physics Letters

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Experimental and theoretical evidence of plasmon-enhanced Kerr rotation in purely ferromagnetic membranes with sufficiently small dimensions to be out of extraordinary optical transmission conditions ͑45 nm pore diameter, 90nm lattice constant͒, is reported in this work. It is shown that the spectral location of the enhanced Kerr rotation region varies as the refractive index of the material inside the pore is modified. A similar behavior is obtained if the pore radius changes while keeping the pore concentration unchanged. Those are clear signatures indicating that localized surface plasmon resonances propagating along the pores govern the magneto-optical response of the membrane. © 2009 American Institute of Physics. ͓DOI: 10.1063/1.3167297͔ Nanoholed ferromagnetic membranes are attracting a great deal of interest over the last years due to their unique magnetic behavior. [1][2][3][4][5][6] Their magnetic properties are strongly influenced by the precise geometry of the nanostructure, namely the pore diameter and the interpore distance since these parameters control the nucleation and movement of domain walls as well as induce locally distributed magnetic anisotropies absent in unpatterned films. 7,8 From an applied viewpoint, ferromagnetic membranes can be used for developing data storage media based on domain wall structures as well as advanced sensing devices. 1,2,9On a different context, membranes made of noble metals have been deeply studied since they exhibit anomalous optical responses resulting from the excitation of plasmons in the nanostructures, such as the extraordinary optical transmission ͑EOT͒ bands observed in metallic patterned thin films with arrays of subwavelength holes. 10 There have been attempts to control this EOT using liquid crystals 11 or exploiting the intrinsic magneto-optical ͑MO͒ activity present in every metal, 12,13 although this would require huge magnetic fields for the nonferromagnetic membranes. Belotelov et al. 14 have used these extraordinary effects to modify the response of nonstructured MO materials, e.g., using Au film with subwavelength holes array deposited on top of a Bismuth substituted Yttrium Iron garnet ͑BiYIG͒ film. In the spectral region where the EOT takes place, the MO response ͑Kerr signal͒ shows an increase with respect to that of an unpatterned film, which is attributed to the purely optical effect of strong decrease of the reflectance.Ferromagnetic nanostructures have shown interesting optical and MO properties related to the excitation of surface plasmons as shown in ordered arrays of Ni nanowires embedded in an alumina matrix. 15,16 In these nanostructures, the plasmons, propagating along the wires, were responsible of the observed MO response enhancement that has not merely optical origin. Diwekar et al. 17 observed the existence of EOT bands in Co films with subwavelength hole arrays ͑150 nm diameter, 300 nm periodicity͒, which was explained as due to light coupling to surface plasmons on the two film interfaces. Quite recently, Ctistis et al. 18 ha...

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“…Generally, the studies have been focused in antidot systems of single layered magnetic materials ; and more recently on multilayered ones [25][26][27][28][29][30][31][32][33]. Antidots of NiFe (Py) [1,[5][6][7][8][9][10][11][12][13][14][15][16] and Ni [17,18] films are widely studied presenting an increased coercivity compared to the continuous form. Antidots made of Co present a large enhancement of the coercivity [2][3][4][19][20][21][22][23][24], and are usually deposited with Pt for out of plane recording purposes [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties of Co/Cu/Py Antidot Films With Different Pore Diameters

et al. 2014

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The magnetic properties of ordered nanoscale Co/Cu/Py multilayer antidot films with different pore sizes prepared on top of nanoporous alumina membranes are presented. By using Co and Py films separated by a Cu thin layer, and tuning the pore diameters of the NAMs we were able to play with the coercivity of the films and observe stepped magnetization curves, as a consequence of the different coercivities of the Co and Py films. The magnetic properties of the multilayer antidots have been measured and compared with results obtained for antidots of Cu/Py. The magnetization reversal process that occurs in each individual layer and in the multilayer was studied by means of micromagnetic simulations.* Email: joel.briones@usach.cl I. INTRODUCTIONNanostructured magnetic elements have received much attention from the scientific community in the last two decades due to their potential applications, ranging from sensors for the electronic and electromechanical industry to the storage media for the magnetic recording industry. The magnetic nanostructures usually referred as antidots are based on magnetic thin films with periodic arrays of holes. In the last years the study of magnetic nanoparticles based on arrays of antidots have attracted intensive attention because they are a promising candidates for a new generation of ultra-high-density magnetic storage media, and an exciting topic in fundamental physics . In an antidot array, magnetic features such as coercive field, anisotropy axes and reversal mechanisms, among others, can be tailored by tuning the geometric parameters of the array [1][2][3][4]. Generally, the studies have been focused in antidot systems of single layered magnetic materials ; and more recently on multilayered ones [25][26][27][28][29][30][31][32][33]. Antidots of NiFe (Py) [1,[5][6][7][8][9][10][11][12][13][14][15][16] and Ni [17,18] films are widely studied presenting an increased coercivity compared to the continuous form. Antidots made of Co present a large enhancement of the coercivity [2][3][4][19][20][21][22][23][24], and are usually deposited with Pt for out of plane recording purposes [25][26][27]. Arrays of Co/Cu/NiFe, CoFe/Cu/NiFe and [Co/Cu] N multilayered antidots have been studied previously by means of magneto-transport measurements [28][29][30]. In this work we present the magnetic properties of ordered nanoscale Co/Cu/Py antidots arrays with different pore sizes prepared on top of nanoporous alumina membranes (NAMs). By using Co and Py films separated by a Cu thin layer, and tuning the pore diameters of the NAMs we were able to play with the coercivity of the films and observe stepped magnetization curves, as a consequence of the different coercivities of the Co and Py films. By systematic measurements of the magnetic and magnetotransport properties of these samples, and comparing with simulations, we were able to understand in more detail the magnetization reversal that takes place in these multilayer antidots. II.EXPERIMENTAL PROCEDURE Nanoporous alumina membranes were prepared fr...

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Ordered Ni nanohole arrays with engineered geometrical aspects and magnetic anisotropy

Cited by 61 publications

References 26 publications

A micromagnetic study of the reversal mechanism in permalloy antidot arrays

A micromagnetic study of the reversal mechanism in permalloy antidot arrays

Plasmon-enhanced magneto-optical activity in ferromagnetic membranes

Magnetic Properties of Co/Cu/Py Antidot Films With Different Pore Diameters

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