Nonlinear and linear Kerr studies of multilayers

Wierenga, H.A.; Jong, de W Wim; Prins, Mwj Menno; Rasing, T.H.M.; Vollmer, R.; Kirilyuk, Andrei; Schwabe, H.; Kirschner, J.

doi:10.1016/0039-6028(95)00165-4

Cited by 14 publications

(14 citation statements)

References 18 publications

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“…Further details on sample preparation can be found in [23]. Co-thickness (ML) the Co-film thickness.…”

Section: Shg From Magnetic Multilayersmentioning

confidence: 99%

Studies of buried interfaces by optical second-harmonic generation

Rasing¹

1994

Appl. Phys. A

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Abstract. Optical Second-Harmonic Generation (SHG) has been used to study the technologically very important buried semiconductor-metal and magnetic multilayer interfaces. For the case of GaAs-Au, the SHG intensity is shown to depend on the applied bias and Schottky barrier height, and is strongly affected by the sweepout of the carriers generated by the fs excitation pulses. For the M/Co/M multilayers, with M = Cu or Au, the SHG signals appear to depend strongly on the magnetization and can be shown to be interface specific. PACS: 42.65, 73.30, 75.70 Nonlinear optical techniques like Second-Harmonic Generation (SHG) and Sum-Frequency Generation (SFG) have been proven to be versatile and sensitive surface and interface probes, that derive their surface specificity from the symmetry breaking at interfaces [1,2]. In particular, they are unique for studying buried interfaces, that are practically inaccessible by other than optical techniques. Such interfaces, like semiconductormetal, metal-metal, metal-electrolyte and various other interfaces, are highly relevant from a practical point of view, but also pose many fundamental questions about the interfacial electronic structure and dynamics. In this paper two of such interface problems will be adressed: the electric-field dynamics at a Schottky barrier and the magnetic structure of interfaces between thin films of magnetic and nonmagnetic materials. Though both studies rely on field-induced effects (electrical and magnetic, respectively), the observed signals appear to be quite large and to contain some interesting new results.Paper presented at the 129th WE-Heraeus-Seminar on "Surface Studies by Nonlinear Laser Spectroscopies", Kassel, Germany, May 30 to June 1, 1994 SHG at a metabsemiconductor interfaceThe problem of Schottky barrier formation at a metalsemiconductor interface still attracts a lot of attention, as new developments in material fabrication and structure determination have shown that the precise interface structure plays a crucial role in determining the Schottky barrier height. For electro-optic applications, not only the static electronic structure but even more importantly, the dynamics near these interfaces in extremely relevant, as this will affect the speed of such devices. Recent photoluminescence studies of a Au/GaAs structure have shown unexpected field and laser intensity dependences at quite moderate laser powers (10 mW) that are commonly met in optical semiconducting devices [3,4]. Theoretical models suggest a very rapid drop of the effective barrier height as a result of the spatial separation of the carriers excited by the incident laser puls (carrier sweepout). However, the photoluminescence is only indirectly affected by this interface field, as the signal is coming from a large bulk region. Very recently, Qi et al. [5] showed the power of SHG to probe the band bending region in GaAs. A direct way to probe the (time evolution of the) effective Schottky barrier height would be to measure the field induced SHG with ultra-short excitat...

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“…Further details on sample preparation can be found in [23]. Co-thickness (ML) the Co-film thickness.…”

Section: Shg From Magnetic Multilayersmentioning

confidence: 99%

Studies of buried interfaces by optical second-harmonic generation

Rasing¹

1994

Appl. Phys. A

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“…13 Indication of such a shift has in fact been observed in surface sensitive second-harmonic-generation measurements of the induced magnetization in thin films of Cu deposited on a Co fcc ͑001͒ substrate. 14 Here we explain how the QW mechanism may lead to a magnetic transition in thin films of Rh, Pd, and Pt deposited on a Ag ͑001͒ substrate.…”

Section: Introductionmentioning

confidence: 98%

Quantum-well-induced ferromagnetism in thin films

et al. 1997

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We have used a first-principles Green's-function technique to investigate the magnetic properties of thin films of Rh, Pd, and Pt deposited on a fcc Ag ͑001͒ substrate. We find that the magnetic moment of the film is periodically suppressed and enhanced as a function of film thickness. The phenomenon is explained in terms of quantum-well states moving through the Fermi level with increasing film thickness.

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“…Due to the fact that SHG is also generated at buried interfaces, properties of different interfaces in multilayer systems could be separated [31,32]. For that purpose it was important that the size of the nonlinear magneto-optical effects, namely the nonlinear Kerr rotation, is strongly increased compared to linear optics [33,34].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear magneto-optics of Fe monolayers from first principles: Structural dependence and spin-orbit coupling strength

1998

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We calculate the nonlinear magneto-optical response of free-standing fcc (001), (110) and (111) oriented Fe monolayers. The bandstructures are determined from first principles using a full-potential LAPW method with the additional implementation of spin-orbit coupling. The variation of the spinorbit coupling strength and the nonlinear magneto-optical spectra upon layer orientation are investigated. We find characteristic differences which indicate an enhanced sensitivity of nonlinear magneto-optics to surface orientation and variation of the in-plane lattice constants. In particular the crossover from onedimensional stripe structures to twodimensional films of (111) layers exhibits a clean signature in the nonlinear Kerr-spectra and demonstrates the versatility of nonlinear magneto-optics as a tool for in situ thin-film analysis.

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Nonlinear and linear Kerr studies of multilayers

Cited by 14 publications

References 18 publications

Studies of buried interfaces by optical second-harmonic generation

Studies of buried interfaces by optical second-harmonic generation

Quantum-well-induced ferromagnetism in thin films

Nonlinear magneto-optics of Fe monolayers from first principles: Structural dependence and spin-orbit coupling strength

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