Optical and magneto-optical characterization of TbFeCo and GdFeCo thin films for high-density recording

Hendren, William; Atkinson, R.; Pollard, Robert; Salter, Ian; Wright, C. David; Clegg, W.W.; Jenkins, David

doi:10.1088/0953-8984/15/9/310

Cited by 19 publications

(7 citation statements)

References 14 publications

(20 reference statements)

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“…The values of the dielectric tensor ["], a 3Â3 matrix, for a GdFeCo layer are taken from measure-ments presented in ref. 24. The orbital radius in eqs.…”

Section: Resultsmentioning

confidence: 99%

Magnetic Field Induced by Various Input Beam Polarizations in All-Optical Magnetic Recording

Vienne

Eason

Xie

et al. 2011

Jpn. J. Appl. Phys.

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In this work, we investigate the role of the input optical beam polarization on the resulting magnetic field generated for applications like all-optical magnetic recording (AOMR). We consider two mechanisms by which a laser source gives rise to a magnetic field: the inverse Faraday effect and an additional mechanism, referred to as optically-induced spin-orbit coupling, which is especially relevant under the very large electrical field associated with ultrashort laser pulse excitation. We compare the direction, magnitude, and spatial extent of the induced magnetic field for both mechanisms. It is found that circular polarization, which generates a strong magnetic field mainly perpendicular to the medium through the inverse Faraday effect, is well-suited to data storage applications. Azimuthal polarization is also favorable, as it results in a purely perpendicular magnetic field, which in this case is solely due to optically-induced spin-orbit coupling. The numerical examples considered here are based on the pulsed titanium-sapphire laser excitation of a GdFeCo medium, as described in typical AOMR experiments.

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“…The values of the dielectric tensor ["], a 3Â3 matrix, for a GdFeCo layer are taken from measure-ments presented in ref. 24. The orbital radius in eqs.…”

Section: Resultsmentioning

confidence: 99%

Magnetic Field Induced by Various Input Beam Polarizations in All-Optical Magnetic Recording

Vienne

Eason

Xie

et al. 2011

Jpn. J. Appl. Phys.

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“…Optical and magneto-optical data used for calculations at λ 0 = 633 nm. The data for AlN was taken from [13] and for GdFeCo and TbFeCo from [14].…”

Section: Quadrilayer and Trilayer Optimizationmentioning

confidence: 99%

The design and optimization of disk structures for MAMMOS/MSR magneto-optic recording

Hendren¹,

Atkinson²,

Pollard³

et al. 2005

J. Phys. D: Appl. Phys.

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Existing quadrilayer and trilayer techniques for optimizing the magneto-optical effects from magnetic materials have been applied to new generation recording media to investigate the possibility of maximizing the signal-to-noise readout performance. Various methods are reviewed and the designs they produce are compared with each other and with the working media found in the literature. In order to address a number of inadequacies, a new numerical approach to the optimization of a quadrilayer structure is used to find further solutions that are considered more suitable for the practical recording media. The effects on design and performance of medium of incidence, type of storage layer and wavelength are all considered.

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“…Finally, an area of considerable topical interest for RE-TM alloys and structures is in the study of magnetization dynamics (fast or ultrafast, laser or synchrotron based) [8], with potential applications in all-optical magnetic recording [9] [10].…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetism in DyRh and DyRhX (X = Fe, Ni, Co, Gd) thin films

Scheunert

Ambrose

Hendren³

et al. 2014

J. Phys. D: Appl. Phys.

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In an effort to achieve large high-field magnetization and increased Curie temperature, polycrystalline DyRh, (DyRh) 95 X 5 and (DyRh) 85 X 15 (X = Fe, Co, Ni, Gd) thin films have been prepared via ultra-high vacuum DC co-sputtering on SiO 2 and Si wafers, using Ta as seed and cap material. A body-centred cubic CsCl-like crystal formation (B2 phase) was achieved for DyRh around the equiatomic equilibrium, known from single crystals. The maximum in-plane spontaneous magnetization at T = 4K in fields of µ 0 H = 5T of was found to be µ 0 M S,4K = (1.50 ± 0.09)T with a ferromagnetic transition at T C = (5 ± 1)K and a coercivity of µ 0 H C,4K[D] = (0.010 ± 0.001)T (at T = 4K) for layers deposited on substrates heated to 350°C. Samples prepared at room temperature exhibited poorer texture, smaller grains and less B2-phase content; this did impact on the Curie temperature which was higher compared to those layers with best crystallisation; however the maximal magnetization stayed unaffected. Ferromagnetic coupling was observed in ternary alloys of DyRhGd and DyRhNi with an increased Curie temperature, larger initial permeability, and high-field magnetization which was best for (DyRh) 85 Gd 15 with µ 0 M S,4K[Gd15] = (2.10 ± 0.13)T.DyRhFe and DyRhCo showed antiparallel coupling of the spontaneous magnetic moments.

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Optical and magneto-optical characterization of TbFeCo and GdFeCo thin films for high-density recording

Cited by 19 publications

References 14 publications

Magnetic Field Induced by Various Input Beam Polarizations in All-Optical Magnetic Recording

Magnetic Field Induced by Various Input Beam Polarizations in All-Optical Magnetic Recording

The design and optimization of disk structures for MAMMOS/MSR magneto-optic recording

Ferromagnetism in DyRh and DyRhX (X = Fe, Ni, Co, Gd) thin films

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