Enhancement of the magneto-optical Kerr rotation in Fe/Cu bilayered films

Katayama, T.; Suzuki, Y.; Awano, Hiroyuki; Nishihara, Y.; Koshizuka, N.

doi:10.1103/physrevlett.60.1426

Cited by 216 publications

(67 citation statements)

References 10 publications

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“…When a linearly polarized light reflects from a medium surrounded by the magnetic field, the polarization plane undergoes a rotation is the magneto-optical Kerr effect [30,31]. The Kerr effect can be used for determining the surface sensitivity of material, studying magnetic materials on account of its robustness and so on [32].…”

Section: Resultsmentioning

confidence: 99%

Photonic spin Hall effect in topological insulators

et al. 2013

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In this paper we theoretically investigate the photonic spin Hall effect (SHE) of a Gaussian beam reflected from the interface between air and topological insulators (TIs). The photonic SHE is attributed to spin-orbit coupling and manifests itself as in-plane and transverse spin-dependent splitting. We reveal that the spin-orbit coupling effect in TIs can be routed by adjusting the axion angle variations. Unlike the transverse spin-dependent splitting, we find that the in-plane one is sensitive to the axion angle. It is shown that the polarization structure in magneto-optical Kerr effect is significantly altered due to the spin-dependent splitting in photonic SHE. We theoretically propose a weak measurement method to determine the strength of axion coupling by probing the in-plane splitting of photonic SHE.

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Section: Resultsmentioning

confidence: 99%

Photonic spin Hall effect in topological insulators

et al. 2013

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“…This has been attributed to various physical origins such as interband transitions and spin orbit coupling. 9,10 KR enhancement in the case of ferromagnetic layers embedded in metallic matrices has been more widely attributed to plasma resonance of free carriers in the nonmagnetic noble metals 11,12 and also to sharp surface plasmon resonance of noble metals in total reflection geometry. 13 In the case of a single substrate, Feil and Hass ͑FH͒ 14 have suggested a different explanation for large MOKE.…”

Section: Introductionmentioning

confidence: 99%

Application of plasma resonance condition for prediction of large Kerr effects

Puri

2002

Journal of Applied Physics

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Resonance like enhancement of magneto-optic Kerr effects ͑MOKEs͒ have been attributed to numerous effects, one of them being plasma resonance of free charge carriers, which is analytically and numerically investigated here. Analytical expressions for frequency dependent enhancement of MOKE are obtained in the general framework of the Drude model, which are then applied to well known expressions describing MOKE. The derived expressions are numerically tested for various optical constants. It is known that for certain materials, the resonance like enhancements in the Kerr spectrum occur in the near vicinity of Re͓ xx ͔ϭ1, which is generally near the plasma edge. This is seen to be true when the plasma frequency p is greater in magnitude as compared to the cyclotron frequency c , i.e., if p ӷ c , whereas in the event of a large reflection edge split, i.e., if p ϳ c the resonance like peaks will occur near Re͓ ϩ . Ϫ ͔Ϸ1, which is a relatively more general condition as compared to Re͓ xx ͔ϭ1. Second, we see through model calculations that the spectral proximity of the MOKE resonance peak to the plasma edge is also subject to the magnitude of the background dielectric constant. Results are explained analytically and numerically. Good agreement is obtained between the expressions derived here and the numerically observed occurrence of resonance like peaks in the Kerr spectrum.

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“…Kerr rotation ͑KR͒ enhancement in the case of ferromagnetic layers embedded in metallic matrices has been more widely attributed to plasma resonance of free carriers in the nonmagnetic noble metals 4,5 and also to sharp surface plasmon resonance of noble metals in total reflection geometry. 6 It has also been reported [7][8][9] that enhancement of KR is possible by deposition of a low refractive index dielectric ͑DE͒ film on top of the MO material.…”

Section: Introductionmentioning

confidence: 99%

Cyclotron frequency coupled enhancement of Kerr rotation in low refractive index-dielectric/magneto-optic bilayer thin-film structures

Puri

2002

Journal of Applied Physics

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We investigate the enhancement of magneto-optic polar Kerr rotation over a broad range of optical frequencies. The Drude model for the dielectric tensor is considered. Resonance-like peaks in the Kerr rotation and ellipticity caused in the vicinity of a plasma edge is extended throughout the visible spectrum by deriving an expression for the cyclotron frequency such that Re(⑀ xx )ϳ1 at any given incident photon energy and plasma frequency of the material. The Kerr rotation obtained by use of this expression was studied for the case of InSb and further enhancement of Kerr rotation was achieved in the case of LiF/InSb bilayer thin-film structure, grown on a glass substrate. The numerical analysis was carried out using a 2ϫ2 characteristic matrix, which takes into account multiple reflections and interface effects within the medium. In addition the role of various magneto-optic material parameters and layer thicknesses is investigated in determining the optical frequency at which the maximum Kerr rotation occurs, under the present cyclotron frequency condition. Enhanced Kerr rotation greater than 1.5°over a broad range of optical frequencies was obtained. Tables showing optimum figure of merit for repeated LiF/InSb bilayers at 3.1 eV for different plasma frequencies are also provided.

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Enhancement of the magneto-optical Kerr rotation in Fe/Cu bilayered films

Cited by 216 publications

References 10 publications

Photonic spin Hall effect in topological insulators

Photonic spin Hall effect in topological insulators

Application of plasma resonance condition for prediction of large Kerr effects

Cyclotron frequency coupled enhancement of Kerr rotation in low refractive index-dielectric/magneto-optic bilayer thin-film structures

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