Faraday and Kerr Effects in Ferromagnets

Shinagawa, K.

doi:10.1007/978-3-662-04143-7_5

Cited by 31 publications

(32 citation statements)

References 29 publications

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“…First proposed for iron garnets [1] and developed further for a wider class of ferric oxide compounds [2], the idea that their optic and magneto-optic properties in the near UV range and the fundamental optic absorption edge are determined by the oxygen-to-3d metal ion charge-transfer (CT) transitions has become widespread [3,4]. However, there is no consistent theory of CT states and transitions in 3d oxides.…”

Section: Introductionmentioning

confidence: 99%

Optics of Chromites and Charge‐Transfer Transitions

Zenkov¹

2008

Physics Research International

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Specific features of the charge-transfer (CT) states and O 2p → Cr 3d transitions in the octahedral (CrO 6 ) 9− complex are considered in the cluster approach. The reduced matrix elements of the electric-dipole transition operator are calculated on many-electron wave functions of the complex corresponding to the initial and final states of a CT transition. Modeling the optic spectrum of chromites has yielded a complicated CT band. The model spectrum is in satisfactory agreement with experimental data which demonstrates the limited validity of the generally accepted concept of a simple structure of CT spectra.

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Section: Introductionmentioning

confidence: 99%

Optics of Chromites and Charge‐Transfer Transitions

Zenkov¹

2008

Physics Research International

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“…Here S z = B 5/2 ((5/2)µ B B/k(T Mn +T 0 )) is the average of Mn spin which is described by standard Brillouin function B 5/2 (y) for Mn spin = 5/2, µ B is the Bohr magneton, k is the Boltzman constant, T Mn is the Mn spin temperature, T 0 is the phenomenological parameter which describes the antiferromagnetic weak long range interaction between Mn-Mn spin [7]. Also clearly visible is the emission from the nonmagnetic Cd 0.97 Mg 0.03 Te spacer at 1.647 eV that is nearly independent of the magnetic field.…”

Section: Resultsmentioning

confidence: 99%

“…As the spin aligner is usually located on the top of the spin detection region in most of the proposed spintronics devices, a contribution from magnetic circular dichroism (MCD) should be taken into account or its contribution carefully ruled out [4,7]. Of course, the ruling it out is important only to properly estimate the degree of the spin injection efficiency, not for the injection process itself.…”

Section: Magnetic Circular Dichroismmentioning

confidence: 99%

Injection of Optically Generated Spins through Magnetic Nonmagnetic Heterointerface: Ruling out Possible Detection Artifacts

2004

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We report on injection of optically created spin-polarized carriers into CdTe-based materials. The injected spins are initially aligned in a diluted magnetic semiconductor CdMnTe layer located on the top of CdMgTe layer in CdMnTe/CdMgTe spintronic generic model structures. A critical discussion of possible artifacts that may complicate the spin detection and its quantitative analysis is given. Although the spin injection efficiency, ∼ 80%, has been found by us to be basically independent of the thickness of the spin detecting layer, there is an essential difference between thin and wide detectors related to the strain-induced lifting of the valence band degeneracy in the former, when assessing the efficiency of the spin injection. Most importantly, we observe an effect of switching the spin injection process on and off by an external magnetic field variation within a relatively narrow field range. This effect can be achieved by a careful design of the interface between the diluted magnetic semiconductor and the non-magnetic semiconductor.

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“…The symmetry breaking from the magnetization dictates that the off-diagonal elements of the dielectric tensor are odd in the magnetization, and the diagonal elements even [84].…”

Section: Chaptermentioning

confidence: 99%

“…The off-diagonal component of the optical conductivity is calculated formally using the Kubo formalism [84], and the optical conductivity is directly related to the dielectric susceptibility discussed in the previous section through the formula:…”

Section: Quantum Mechanical Descriptionmentioning

confidence: 99%

Ultrafast Magnetization Dynamics of SrRuO<sub>3 </sub>Thin Films

Langner

2009

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Itinerant ferromagnet SrRuO 3 has drawn interest from physicists due to its unusual transport and magnetic properties as well as from engineers due to its low resistivity and good lattice-matching to other oxide materials. The exact electronic structure remains a mystery, as well as details of the interactions between magnetic and electron transport properties.This thesis describes the use of time-resolved magneto-optical Kerr spectroscopy to study the ferromagnetic resonance of SrRuO 3 thin films, where the ferromagnetic resonance is initiated by a sudden change in the easy axis direction in response to a pump pulse.The rotation of the easy axis is induced by laser heating, taking advantage of a temperature-dependent easy axis direction in SrRuO 3 thin films. By measuring the change in temperature of the magnetic system in response to the laser pulse, we find that the specific heat is dominated by magnons up to unusually high temperature, ∼ 100 K, and thermal diffusion is limited by a boundary resistance between the film and the substrate that is not consistent with standard phonon reflection and scattering models.We observe a high FMR frequency, 250 GHz, and large Gilbert damping parameter, α ≈ 1, consistent with strong spin-orbit coupling. We observe a time-dependent change in the easy axis direction on a ps time-scale, and we find that parameters associated with the change in easy axis, as well as the damping parameter, have a non-monotonic temperature dependence similar to that observed in anomalous Hall measurements. Professor Joseph Orenstein Dissertation Committee Chair iFor my family ii

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Faraday and Kerr Effects in Ferromagnets

Cited by 31 publications

References 29 publications

Optics of Chromites and Charge‐Transfer Transitions

Optics of Chromites and Charge‐Transfer Transitions

Injection of Optically Generated Spins through Magnetic Nonmagnetic Heterointerface: Ruling out Possible Detection Artifacts

Ultrafast Magnetization Dynamics of SrRuO<sub>3 </sub>Thin Films

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