Photoinduced coherent magnetization precession in epitaxial<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>La</mml:mi><mml:mn>0.67</mml:mn></mml:msub><mml:msub><mml:mi>Ca</mml:mi><mml:mn>0.33</mml:mn></mml:msub><mml:msub><mml:mi>MnO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>films

Talbayev, Diyar; Zhao, Hui; Lüpke, G.; Venimadhav, A.; Li, Qi

doi:10.1103/physrevb.73.014417

Cited by 23 publications

(25 citation statements)

References 42 publications

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“…7 Ultrafast optical spectroscopy has recently been used in the study of correlated electron materials. [8][9][10][11][12][13][14][15][16] For example, in the heavy fermion YbAgCu 4 , 8 time-resolved photoinduced reflectivity ( R/R) measurements display a divergence of the electron-phonon relaxation time τ at the lowest temperatures. In another heavy fermion Yb 14 MnSb 11 , the coupling between an optical phonon mode and the Kondo effect was observed.…”

Section: Introductionmentioning

confidence: 99%

Time-resolved quasiparticle dynamics of the itinerant antiferromagnet UPtGa5

et al. 2011

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Time-resolved photoinduced reflectivity is measured in the spin-density-wave phase of the itinerant antiferromagnet UPtGa 5 . Two relaxation components were seen: (a) a slow component whose amplitude appears below T N , and relaxation time τ slow exhibits an upturn near T N , and (b) the fast component persists at all temperatures, with the relaxation time τ fast also exhibiting an upturn near T N . Comparing with pump-probe data on UNiGa 5 , the differences are explained in the context of UPtGa 5 having A-type (rather than G-type) antiferromagnetism, resulting in partial Fermi surface nesting, partial gapping, and consequently finite density of states at the Fermi surface.

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Section: Introductionmentioning

confidence: 99%

Time-resolved quasiparticle dynamics of the itinerant antiferromagnet UPtGa5

et al. 2011

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“…For a uniform precession mode, a large frequency at very low fields can only be observed in thin films that are anisotropic in the sample plane. In such films, the in-plane anisotropy field acts like an effective field and provides the torque to the magnetization [14,15]. However, the LMO 2n =SMO n superlattices exhibit negligible in-plane anisotropy, as mentioned previously.…”

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confidence: 96%

Viscous Spin Exchange Torque on Precessional Magnetization in(LaMnO3)2n/(SrMnO3)

et al. 2008

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Photoinduced magnetization dynamics is investigated in chemically ordered (LaMnO3)2n/(SrMnO3)n superlattices using the time-resolved magneto-optic Kerr effect. A monotonic frequency-field dependence is observed for the n=1 superlattice, indicating a single spin population consistent with a homogeneous hole distribution. In contrast, for n> or =2 superlattices, a large precession frequency is observed at low fields indicating the presence of an exchange torque in the dynamic regime. We attribute the emergence of exchange torque to the coupling between two spin populations-viscous and fast spins.

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“…Ultrafast heating by laser pulses is used to induce magnetization dynamics through the temperature dependence of the magnetic anisotropy. [26][27][28][29][30] The technique has the advantage of allowing the magnetization dynamics to be studied over a continuous range of frequencies. By fitting the time dependent Kerr signals to a macrospin solution of the Landau-Lifshitz-Gilbert ͑LLG͒ equation, values are obtained for the effective fields acting upon the magnetization and values for the cubic anisotropy constant and total apparent damping parameter are deduced.…”

Section: Introductionmentioning

confidence: 99%

Optically induced magnetization dynamics and variation of damping parameter in epitaxialCo2MnSiHeusler alloy films

et al. 2010

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All-optical pump-probe measurements of magnetization dynamics have been performed upon epitaxial Co 2 MnSi͑001͒ Heusler alloy thin films annealed at temperatures of 300, 400, and 450°C. An ultrafast laserinduced modification of the magnetocrystalline anisotropy triggers precession which is detected by timeresolved magneto-optical Kerr effect measurements. From the damped oscillatory Kerr rotation, the frequency and relaxation rate of the precession is determined. Using a macrospin solution of the Landau-Lifshitz-Gilbert equation the effective fields acting upon the sample magnetization are deduced. This reveals that the magnetization is virtually independent of the annealing temperature while the fourfold magnetocrystalline anisotropy decreases dramatically with increasing annealing temperature as the film structure changes between the B2 and L2 1 phases. From the measured relaxation rates, the value of the apparent Gilbert damping parameter is found to depend strongly upon the static field strength and in-plane static field orientation. The variation of the apparent damping parameter is generally well reproduced by an inhomogeneous broadening model in which the presence of B2 and L2 1 phases leads to a large dispersion of the magnetocrystalline anisotropy. However, for the sample annealed at a temperature of 300°C, the lack of a detailed fit to the data suggests that the apparent anisotropy of the apparent damping parameter might alternatively arise due to a network of dislocations with fourfold symmetry.

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Photoinduced coherent magnetization precession in epitaxialLa0.67Ca0.33MnO3films

Cited by 23 publications

References 42 publications

Time-resolved quasiparticle dynamics of the itinerant antiferromagnet UPtGa5

Time-resolved quasiparticle dynamics of the itinerant antiferromagnet UPtGa5

Viscous Spin Exchange Torque on Precessional Magnetization in(LaMnO3)2n/(SrMnO3)

Optically induced magnetization dynamics and variation of damping parameter in epitaxialCo2MnSiHeusler alloy films

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