Magneto-optical additivity in ferromagnetic bilayers separated by nonferromagnetic spacers

Nývlt, M.; Przybylski, M.; Grabowski, J.; Kirschner, Jessica

doi:10.1063/1.1996827

Cited by 9 publications

(7 citation statements)

References 20 publications

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“…Separation of polar MO signal from films in different depths was presented by Ferré [6] and Hamrle et al [7], [8] in the case of Co films separated by Au spacer. The depth sensitivity of longitudinal Kerr effect in Fe/Cr/Fe structure was demonstrated by Nývlt [9]. The depth sensitivity of soft X-ray resonant MO Kerr effect was reported by Lee et al [10] and Kim et al [11].…”

Section: Introductionmentioning

confidence: 89%

Material Selective Sensitivity of Magneto-Optical Kerr Effect in NiFe/Au/Co/Au Periodic Multilayers

et al. 2008

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Material selective sensitivity of a magneto-optical polar Kerr effect to magnetizations of films from different materials in a multilayer system is presented. The method is supported by rigorous modeling of magneto-optic response from the multilayer system and by experimental demonstration on the periodic cobalt-permalloy multilayers [Ni 80 Fe 20 (2 nm)/Au(2 nm)/Co(0.4, 0.8, and 1.2 nm)/Au(2 nm)] 10 .

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Section: Introductionmentioning

confidence: 89%

Material Selective Sensitivity of Magneto-Optical Kerr Effect in NiFe/Au/Co/Au Periodic Multilayers

et al. 2008

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“…In contrast, on semiconducting substrates, e.g., GaAs, the Kerr angle of Fe is mainly real and the additivity holds for the rotation, but not for the ellipticity. 6 For thicker layers, the phase of the electromagnetic wave inside the Fe layer changes due to the real part of the perpendicular wave-vector component k Ќ and, therefore, gives rise to negative Kerr ellipticity contributions coming from Fe layers buried deeper than about 12 nm, where the slope changes sign. On the other hand, the imaginary part of the wave vector k Ќ leads to a decreasing intensity of the electromagnetic wave with increasing depth inside the film, which determines the information depth of about 40 nm, where the slope begins to asymptotically flatten.…”

Section: A Linear Mokementioning

confidence: 99%

“…5-is generally not valid. 6 Therefore, a general numerical treatment of the MOKE by solving Maxwell's equations and the standard boundary conditions is indispensable for the quantitative interpretation of the Kerr angle. A prerequisite for this calculation is the precise knowledge of the optical and magneto-optical material parameters.…”

Section: Introductionmentioning

confidence: 99%

Thickness dependence of linear and quadratic magneto-optical Kerr effects in ultrathin Fe(001) films

Büchmeier¹,

Schreiber

Bürgler

et al. 2009

Phys. Rev. B

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Magneto-optical ͑MO͒ Kerr effect ͑MOKE͒ magnetometry is one of the most widely employed techniques for the characterization of ferromagnetic thin-film samples. Some information, such as the magnitude of coercive fields or anisotropy strengths, can be readily obtained without any knowledge of the optical and MO properties of the material. On the other hand, a quantitative analysis, which requires precise knowledge of the material's index of refraction n and the MO-coupling constants K and G, is often desirable, for instance, for the comparison of samples which are different with respect to ferromagnetic layer thicknesses, substrates, or capping layers. While the values of the parameters n and the linear MO-coupling parameter K reported by different authors usually vary considerably, the relevant quadratic MO-coupling parameters G even for Fe are completely unknown. Here, we report on measurements of the thickness dependence ͑0-60 nm͒ of the linear and quadratic magneto-optical effects in epitaxial bcc-Fe͑001͒ wedge-type samples performed at a commonly used laser wavelength of 670 nm. By fitting the thickness dependence we are able to extract a complete set of parameters n, K, ͑G 11 − G 12 ͒, and G 44 for the quantitative description of the MOKE response of bcc-Fe͑001͒. We find the parameters n, K, and G to significantly differ for films thinner than about 10 nm as compared to those for thicker films, which is indicative of a thickness dependence of the electronic properties or of surface contributions to the MOKE. The magnitude of the quadratic magneto-optical effect is found to be about one-third of the record values reported recently for Co 2 FeSi.

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“…The authors demonstrated separation from hysteresis loops of different Co layers showing different coercivity. The depth sensitivity of longitudinal Kerr effect in Fe/Cr/Fe structure was demonstrated by Nývlt [31]. The depth sensitivity of soft x-ray resonant magneto-optical Kerr effect was reported by Lee et al [32] and Kim et al [33].…”

Section: Basis Of Mo Selectivity To Magnetic Nanostructuresmentioning

confidence: 79%

Selective sensitivity of ellipsometry to magnetic nanostructures

et al. 2011

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Magneto-optic (MO) ellipsometry of ferromagnetic materials is extremely sensitive to ultra-thin films, multilayers, and nanostructures. It gives a possibility to measure all components of the magnetization vector in the frame of the magneto-optic vector magnetometry and enable us to separate magnetic contributions from different depths and materials in nanostructures, which is reviewed in this article. The method is based on ellipsometric separation using the selective MO Kerr effect. The figure of merit used to quantify the ellipsometric selectivity to magnetic nanostructures is defined on the basis of linear matrix algebra. We show that the method can be also used to separate MO contributions from areas of the same ferromagnetic materials deposited on different buffer layers. The method is demonstrated using both: (i) modeling of the MO ellipsometry response and (ii) MO measurement of ultra-thin Co islands epitaxially grown on self-organized gold islands on Mo/Al 2 O 3 buffer layer prepared using the molecular beam epitaxy at elevated temperatures. The system is studied using longitudinal (in-plane) and polar (perpendicular) MO Kerr effects.

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Magneto-optical additivity in ferromagnetic bilayers separated by nonferromagnetic spacers

Cited by 9 publications

References 20 publications

Material Selective Sensitivity of Magneto-Optical Kerr Effect in NiFe/Au/Co/Au Periodic Multilayers

Material Selective Sensitivity of Magneto-Optical Kerr Effect in NiFe/Au/Co/Au Periodic Multilayers

Thickness dependence of linear and quadratic magneto-optical Kerr effects in ultrathin Fe(001) films

Selective sensitivity of ellipsometry to magnetic nanostructures

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