Magnetization reversal in cobalt antidot arrays

Heyderman, Laura J.; Nolting, F.; Backes, Dirk; Czekaj, S.; López-Dı́az, L.; Kläui, Mathias; Rüdiger, Ulrich; Vaz, C. A. F.; Bland, J. A. C.; Matelon, R. J.; Volkmann, U.G.; Fischer, Peter

doi:10.1103/physrevb.73.214429

Cited by 100 publications

(93 citation statements)

References 31 publications

(37 reference statements)

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“…The periodic θ (r) oscillations inside a superdomain observed in Fig. 10 correspond to that previously reported [11,12]. The magnetization direction tends to be diagonal in the wide area between four holes, but it aligns parallel to the antidot edges, that is, horizontally or vertically, when crossing the narrow necks between adjacent antidots.…”

Section: Magnetic Characterizationsupporting

confidence: 64%

“…Regions with the same average magnetization, but with internal distribution to minimize the magnetic poles around the holes, are called superdomains [11]. They tend to assemble into a chain-like shape [12], as the one encircled in Fig. 7(d).…”

Section: Magnetic Characterizationmentioning

confidence: 99%

“…On the one hand, antidots are known to change the magnetization switching mechanisms [12], acting as pinning centers for domain walls (DWs) [13] and enabling novel magnetic domain configurations connected to the array geometry [14][15][16][17][18] * ccastan@unizar.es such as superdomains [11], that are not observed in an unpatterned film. The antidot geometry can also be used to tailor the coercivity H C : many previous studies report an empirical law according to which H C increases linearly with the inverse of the antidot edge-to-edge separation λ = p − d, where d is the antidot diameter and p the array period, for both λ d [19,20] and λ d [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic antidot to dot crossover in Co and Py nanopatterned thin films

et al. 2014

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The crossover from antidot to dot magnetic behavior on arrays patterned in a ferromagnetic thin film has been achieved by modifying only the geometry. A series of antidot arrays has been fabricated on cobalt with fixed diameter d and by reducing the period of the array p from p d to p < d. A dramatic change in the coercivity dependence with p, correlated with a significant modification in the magnetic domain structure observed by x-ray photoemission electron microscopy, evidences the crossover. An intermediate regime has been found between the superdomain structure present in antidot arrays and the array of astroid-state noncorrelated dots. The study has been reproduced for a different ferromagnetic material, permalloy, and supported by micromagnetic simulations.

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Section: Magnetic Characterizationsupporting

confidence: 64%

Section: Magnetic Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetic antidot to dot crossover in Co and Py nanopatterned thin films

et al. 2014

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“…These two parameters have been shown to influence the coercivities and remanences, 1,2 anisotropies, 3,4 and switching characteristics. 5,6 In parallel, the antidot structures with noble metals have been studied for their optical properties after the pioneering work of Ebbesen et al 7 and the discovery of extraordinary optical transmission of light through these subwavelength structures at certain resonant frequencies or angles of incidence. The investigations have not included the presence of a magnetic field since it is known that for plasmonic metals the influence of a magnetic field is very low and thus the use of very high magnetic fields would be necessary to observe interactions.…”

Section: Introductionmentioning

confidence: 99%

Magneto-optic enhancement and magnetic properties in Fe antidot films with hexagonal symmetry

et al. 2010

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The magneto-optic and magnetic properties of hexagonal arrays of holes in optically thin iron films are presented. We analyze their dependence on the hole radius and compare the results to a continuous iron film of the same thickness. We observe a large enhancement of the magneto-optic Kerr rotation with respect to that of the continuous film, at frequencies where surface-plasmon excitations are expected. The spectral position of the Kerr maxima can be tuned by the size and the distance between the holes. Additional simulations are in very good agreement with the experiment and thus confirm the effect of the surface plasmons on the Kerr rotation. The altering of the magnetic properties by the hole array is also visible in the hysteretic behavior of the sample where a significant hardening is observed.

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“…[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.…”

mentioning

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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Magnetization reversal in cobalt antidot arrays

Cited by 100 publications

References 31 publications

Magnetic antidot to dot crossover in Co and Py nanopatterned thin films

Magnetic antidot to dot crossover in Co and Py nanopatterned thin films

Magneto-optic enhancement and magnetic properties in Fe antidot films with hexagonal symmetry

Plasmon-enhanced magneto-optical activity in ferromagnetic membranes

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