Quadratic effects in the nonlinear magneto-optical response of perovskite manganites studied with magnetization-induced second harmonic generation

Мишина, Е. Д.; Morosov, A. I.; Mishina, A.V.; Moshnyaga, V.; Sudheendra, L.; Samwer, K.; Rasing, T.H.M.

doi:10.1103/physrevb.75.064401

Cited by 8 publications

(7 citation statements)

References 22 publications

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“…Moreover, it was also argued that the quadrupolar lattice contribution dominates magnetization induced optical second-harmonic nonlinearity in LCMO. 30 A slow resistance dynamics was reported earlier in PCMO ͑Refs. 31 and 32͒ and interpreted within the reorganization of CP or charge-density waves.…”

Section: Discussionsupporting

confidence: 59%

Electrical nonlinearity in colossal magnetoresistance manganite films: Relevance of correlated polarons

et al. 2009

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The metal-insulator ͑MI͒ transition in epitaxial thin films of La 0.75 Ca 0.25 MnO 3 ͑LCMO͒ is accompanied by the appearance of an intrinsic electrical nonlinearity. The latter, probed by electrical third harmonic voltage, U 3 , or resistance, R 3 = dU 3 / dJ, is drastically enhanced in the vicinity of the MI transition, T MI = 267 K. Applied magnetic field, B = 5 T, suppresses the nonlinearity, resulting in a huge "nonlinear" CMR 3 ͑T MI ͒ ϳ 10 5 %. R 3 shows a peculiar low-frequency ͑ Յ 1 kHz͒ dependence, R 3 ϳ͑-0 ͒ n , with exponent, n, changing across the MI transition from n ϳ 1,5-2 for T Ն T MI to n =1 ͑T Ͻ T MI ͒. The observed electrical nonlinearity in LCMO reflects the behavior of correlated polarons, the number of which dramatically enhances in the vicinity of T MI . We argued that correlated polarons, considered as electric-elastic quadrupoles, provide a nonlinear ͑quadratic͒ coupling to the electric field, yielding a third harmonic electric nonlinearity in LCMO. The reference film of La 0.7 Sr 0.3 MnO 3 ͑LSMO͒, a prototypic double exchange system with second-order phase transition, is characterized as a linear metallic material in the whole range of temperatures ͑T = 10-400 K͒, magnetic fields ͑B =0-5 T͒, and frequencies ͑ = 1 -1000 Hz͒.

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Section: Discussionsupporting

confidence: 59%

Electrical nonlinearity in colossal magnetoresistance manganite films: Relevance of correlated polarons

et al. 2009

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“…12 However, it should be noted that the discrepancy between the fit and the actual SHG data near T c is due to the changes in the optical constants of the substrate and not related to the samp!e. 24 Thus, the quadratic dependence of the Es 11 a(T) and almost no magnetic-field dependence, Es 11 a(M), in the p-p geometry (inset Fig. 4) evidence the dominance of the quadrupole contribution.…”

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confidence: 99%

“…19 • 6 The fact that the observed stripes are a consequence of quadrupolar characteristics related to the strain can be additionally supported by second-harmonic generation (SHG) experiments. 24 In Fig. 4, the SHG field ESHa(TJ-ls 11 a 112 , ( ls 11 a is the intensity of SHG signal) in the p-p geometry 24 correlates to the quadrate of the magnetization (open circles), quantum interference device (SQUID) measurements.…”

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confidence: 99%

“…24 In Fig. 4, the SHG field ESHa(TJ-ls 11 a 112 , ( ls 11 a is the intensity of SHG signal) in the p-p geometry 24 correlates to the quadrate of the magnetization (open circles), quantum interference device (SQUID) measurements. 12 However, it should be noted that the discrepancy between the fit and the actual SHG data near T c is due to the changes in the optical constants of the substrate and not related to the samp!e.…”

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Direct imaging of lattice-strain-induced stripe phases in an optimally doped manganite film

et al. 2007

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In a Lao. 75 Cao. 25 Mn0 3 /Mg0 film without quenched disorder, we show insulating and metallic stripes above and below the Curie temperature (T c), respectively, by a high-resolution scanning tunneling microscopy (STM) and/or spectroscopy measurement. Formation of these stripes involves competing charge, orbital, and lattice orders and is an outcome of an overlapping of electron wave functions mediated by the lattice strain. The presence of the quadmpolar contribution in the second-harmonic generation experiments supports the strain mediated charge-orbital stripes observed by STM.

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“…To our knowledge the only published value of a second-order MO-coupling constant is the imaginary part of G 44 / K of Ni of about Im͑G 44 / K͒ = −0.02 at the wavelength = 514 nm, which was experimentally determined from Brillouin light-scattering data by Giovannini et al 15 The second-order magnetooptical parameters, which are G 11 , G 12 , and G 44 for systems with cubic symmetry, give rise to MO effects quadratic and even in the magnetization M. These effects are known as quadratic magneto-optical Kerr effect ͑QMOKE͒ or Voigt effect in reflection, and have recently received a lot of attention. 1,[11][12][13][14] Effects quadratic in M also turn out to be important in magnetization-dependent second-harmonic generation ͑MSHG͒, 16 x-ray magnetic linear dichroism, and the closely related x-ray Voigt effect. 17 All the more it is surprising that to our knowledge no one has yet determined a full set of corresponding material parameters G to describe the QMOKE.…”

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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Quadratic effects in the nonlinear magneto-optical response of perovskite manganites studied with magnetization-induced second harmonic generation

Cited by 8 publications

References 22 publications

Electrical nonlinearity in colossal magnetoresistance manganite films: Relevance of correlated polarons

Electrical nonlinearity in colossal magnetoresistance manganite films: Relevance of correlated polarons

Direct imaging of lattice-strain-induced stripe phases in an optimally doped manganite film

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

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