Magneto-optical spectra in Co-based multilayers

Sato, K.; Ikekame, H.; Tosaka, Yasuhiro; Shin, Sung‐Chul

doi:10.1016/0304-8853(93)90686-v

Cited by 9 publications

(5 citation statements)

References 6 publications

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“…The shift of the zero-crossing of η K up to ∼3 eV is accompanied by the formation of a positive two-peak structure with decrease of the amount of Co present. Similar spectral features of the Co/Pd MLS, although within smaller spectral ranges and for other sublayer thicknesses, were observed in references [1,8] and [9]. Inspection of the θ K -and η K -spectra of the MLS leads one to the conclusion that there is a MO contribution independent of, or weakly dependent on, the cobalt sublayer thickness.…”

Section: Resultssupporting

confidence: 76%

“…In spite of the large number of experimental and theoretical investigations [1,8,9,14,16], the mechanism responsible for the MO properties of Co/Pd MLS is far from being completely understood. The magnetic and MO properties of Co/Pd MLS depend on the individual Co and Pd layer thicknesses and are strongly affected by the interface microstructure.…”

Section: Introductionmentioning

confidence: 99%

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The influence of interface structure on the magneto-optical properties of Co/Pd multilayers

Uba¹,

Uba²,

Yaresko³

et al. 1998

J. Phys.: Condens. Matter

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Magneto-optical Kerr effect (MOKE) spectra of Co/Pd multilayered structures (MLS), measured in the polar geometry over the spectral range 0.8-5.5 eV, are presented and compared to spectra obtained from ab initio band-structure calculations. It is shown that the MOKE spectra of the Co/Pd MLS calculated using the spin-polarized relativistic linear-muffin-tin-orbital method reproduce the experimental spectra only moderately well if ideal multilayer structures with sharp interfaces are assumed. Calculations of the magneto-optical (MO) response of MLS with imperfect interfaces modelled by introducing ordered compounds at the interface have also been performed. The results obtained reveal that the MOKE spectra of the Co/Pd MLS can be adequately reproduced using a model of limited interdiffusion within one or two atomic planes at the interface which results in the formation of a Pd-rich alloy. The role of the Pd spin polarization in the formation of the MO spectra as inferred from first-principles calculations is examined and discussed. Finally, the influence of thermal annealing on the MO properties of Co/Pd MLS is studied both experimentally and theoretically. The good agreement between the calculated spectra of the MLS and experimentally observed ones demonstrates the validity of the proposed models. The results obtained demonstrate the crucial role played by the interface microstructure in the formation of the MOKE spectra of the multilayered systems studied.

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Section: Resultssupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

The influence of interface structure on the magneto-optical properties of Co/Pd multilayers

Uba¹,

Uba²,

Yaresko³

et al. 1998

J. Phys.: Condens. Matter

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“…Multilayered ͑ML͒ structures consisting of alternating nonmagnetic and magneto-optically active layers are of significant importance in the field of magneto-optical ͑MO͒ recording. [1][2][3][4] In these ML systems, the magneto-optical Kerr effect ͑MOKE͒ can be strongly enhanced due to the optical properties of the nonmagnetic spacer layers. E.g., in Fe/Cu bilayered films, the Kerr rotation ⌰ K was found to increase strongly in the energetic vicinity of the plasma edge of the underlying Cu layer.…”

Section: Introductionmentioning

confidence: 99%

Enhanced magneto-optical Kerr effect in oxidized Co thin films

Rellinghaus

Ávila

Weller

et al. 1998

Journal of Applied Physics

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We have studied the structural and magneto-optical properties of postdeposition oxidized Co thin films. The oxidization process leads to the formation of a double-layered structure of fcc Co 3 O 4 on top of metallic Co. The magneto-optical Kerr effect ͑MOKE͒, measured in the range 0.8 eV рE Ph р5.5 eV reveals characteristic dependencies of the MOKE spectra on annealing temperature and time. In particular, we observe resonance-type enhancements of the Kerr effects by up to a factor of 10 compared with unannealed metallic Co. The experimental data are quantitatively reproduced by bilayer optical stack calculations.

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“…In particular, it has been shown that in such systems, originally nonmagnetic Pd metal tends to ferromagnetism and magnetic moments of the Pd atoms at the Co/Pd interface can reach up to 0.5 l B [3]. Obviously, the local spin polarization of the Pd interface atoms influences magnetic and magneto-optical properties of the Co/Pd structures [4,5].The magneto-optical Kerr effect (MOKE) is a well established technique to study magnetism of ultra-thin ferromagnetic films and nanostructures [6]. For a given magneto-optical geometry (i.e., the angle of incidence and the incident polarization of light), the slopes of the Kerr observables, rotation and ellipticity, versus thickness of the ferromagnetic film grown on a nonmagnetic substrate originate first in magnetism and optics of the films itself, and second in the optical permittivity of the substrate.…”

mentioning

confidence: 99%

mentioning

confidence: 99%