Magnetooptische und optische Eigenschaften von ferromagnetischen Schichten im Ultraroten

Clemens, Karl Heinz; Jaumann, Johannes

doi:10.1007/bf01377889

Cited by 51 publications

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“…The Faraday rotation observed at zero field, which exceeds 160 mrad (3.8 mrad/nm), is larger than that of the conventional ferromagnets represented by the archetypal MO material Bi:YIG with 0.77 mrad/nm 25,26,[32][33][34][35] (Fig. 4b).…”

Section: Discussionmentioning

confidence: 82%

Giant magneto-optical responses in magnetic Weyl semimetal Co3Sn2S2

et al. 2020

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The Weyl semimetal (WSM), which hosts pairs of Weyl points and accompanying Berry curvature in momentum space near Fermi level, is expected to exhibit novel electromagnetic phenomena. Although the large optical/electronic responses such as nonlinear optical effects and intrinsic anomalous Hall effect (AHE) have recently been demonstrated indeed, the conclusive evidence for their topological origins has remained elusive. Here, we report the gigantic magneto-optical (MO) response arising from the topological electronic structure with intense Berry curvature in magnetic WSM Co3Sn2S2. The low-energy MO spectroscopy and the first-principles calculation reveal that the interband transitions on the nodal rings connected to the Weyl points show the resonance of the optical Hall conductivity and give rise to the giant intrinsic AHE in dc limit. The terahertz Faraday and infrared Kerr rotations are found to be remarkably enhanced by these resonances with topological electronic structures, demonstrating the novel low-energy optical response inherent to the magnetic WSM.

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Section: Discussionmentioning

confidence: 82%

Giant magneto-optical responses in magnetic Weyl semimetal Co3Sn2S2

et al. 2020

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“…1, that in he real case for multilayers with d1=2.0 nm no maxima are observed in this region. Indeed, FR and FE spectra of single layered Co films shown in Fig.5 differ essentially from date [2,3] and more than that the principal FR and FE changes are observed at the transition from thicker to thiner Co layer between 5.0 and 2.0 nm. approaches the observed interval.…”

mentioning

confidence: 70%

“…To determine the position of the maximum it is necessary to analyze properly Exp (2),. (2) near this / value.…”

mentioning

confidence: 99%

<title>Faraday rotation enhancement in the short-wavelength spectral region in multilayered Co/SiO<formula><inf><roman>2</roman></inf></formula> films</title>

Dynnik¹,

Édelman²,

Morozova³

et al. 1998

Optical Information Science and Technology (OIST97): Optical Recording Mechanisms and Media

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Strong changes vre observed in the Faraday rotation (FR) spectra of multilayered Co/SiO films in comj,arison with homogeneous Co films: whereas the FR in homogeneous Co films decreased monotonically as the lIght wave length decreased, FR in multilayered films increased with the ? decreasing. The rate of the FR increase with respect to the change in 2 was progressively greater the thicker the SiO layers and greater the number of layers.One of the most important task of the modern magnetooptics is the creation of materials with high magnetooptical effects in the short wave length spectral region. The resonance enhancement of Faraday rotation (FR) in composite materials consisting of the magnetic metal particles or layers embedded in a dielectric host predicted theoretically (for example [1]) seems to be one of the ys to solve this problem. This resonance is due to surface plasmons in metal particles and its parameters depend on the volume filling factor of the magnetic constituents and on the relation between optical parameters of the dielectric host and magnetic particles or layers. Since optical parameters of extremely thin layers can change considerably in comparison with bulk metals of thick homogeneous films, the experimental investigation is necessary to make clear the real possibility of FR enhancement in the short wave length region in the composite materials discussed. To begin with have chosen multilayered films consisting of alternating layers of the classic magnetic metal Co and one of the most transparent in the short wave length region dielectrics SiO.Here we present the results of the investigation of FR, optical absorption and magnetooptical figure of merit of Co/SiO. multilayers in dependence on Co and SiO layers thickness and on the number of layers.

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“…This logic leads to the idea that the large positive slope at high fields at higher photon energies comes from the EuO contribution which is opposite in sign to Co and which does not saturate. If we use the data of Clemens and Jaumann [7] for the Kerr angle of Co, suitably scaled, we can extract the EuO contribution as shown for comparison [5]. The EuO peak in the Co-Tb-EuO film is positive with a maximum at 1.7 eV.…”

Section: Resultsmentioning

confidence: 99%

EuO/Tb-Fe-Co EXCHANGE COUPLED FILMS

Gambino

1995

J. Magn. Soc. Jpn.

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~ Macroscopic ferrimagnets have been prepared by codepositing Co I Tb and EU 2 0 3 bye-beam evaporation. The films show compensation temperatures at compositions which indicate that the europium is in the divalent state and is coupled antiparallel to the Co magnetization. Under the present conditions of deposition, these films do not show perpendicular easy axis anisotropy, whereas previously studied Co-EuS films did. At room temperature there is magneto-optical evidence that the EuO precipitate phase is coupled antiparallel to the cobalt. That is, a film with 80 mole % Co (in the Co dominated composition range) shows a positive peak in the Kerr spectrum at 1.7 eV, whereas a Tb doped EuO film shows a negative peak in the same energy range. The change of sign of the Kerr peak shows that the EuO phase is coupled antiparallel to the cobalt.

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Magnetooptische und optische Eigenschaften von ferromagnetischen Schichten im Ultraroten

Cited by 51 publications

References 0 publications

Giant magneto-optical responses in magnetic Weyl semimetal Co3Sn2S2

Giant magneto-optical responses in magnetic Weyl semimetal Co3Sn2S2

<title>Faraday rotation enhancement in the short-wavelength spectral region in multilayered Co/SiO<formula><inf><roman>2</roman></inf></formula> films</title>

EuO/Tb-Fe-Co EXCHANGE COUPLED FILMS

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