Absorption spectra ofY3Fe5

G. B. Scott

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D. E. Lacklison

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J. L. Page

³

Phonon and magnon scattering of antiferromagneticBi2Fe4O9

“…These general considerations are confirmed experimentally and theoretically for Y 3 Fe 5 O 12 , where the weak absorption between 1.2 and 2.2 eV and abrupt absorption rise above 2.4 eV have been assigned to 6 S → 4 G crystal-field transitions, respectively, in Fe 3+ O 6 octahedra and Fe 3+ O 4 tetrahedra. 16,17,19 In the time scale of phonon vibrations an electronic transition is essentially instantaneous, which means that immediately after the transition the atomic positions are the same as in the initial state. The final state, however, requires different equilibrium position, which is achieved by the FranckCondon process of phonon emission as illustrated in Fig.…”

“…Indeed, unlike the isostructural Bi 2 Ga 4 O 9 , which is transparent in the visible range 20 and has similar Raman spectra, Bi 2 Fe 4 O 9 is an opaque material, the absorption being caused by transitions between the 3d 5 levels of Fe 3+ split by tetrahedral or octahedral crystal field. 21 16,17,19 In the photon-energy range of interest ͑1.9-2.6 eV͒ are the transitions from the ground 6 S͑A 1g / A 1 ͒ state of Fe 3+ ͑d 5 ͒ to the first excited 4 G͑T 1g / T 1 ͒ and 4 G͑T 2g / T 2 ͒ states splitoff by the orthohedral/tetrahedral crystal field. In octahedral field the transitions between 6 S and any 4 G manifold levels are parity forbidden, which results in very weak absorption.…”

“…Such strongly resonant behavior is most likely linked to the electronic d-d transition between the levels of Fe 3+ splitted by Ϸ2.6 eV in the octahedral and/or tetrahedral crystal field. [16][17][18][19] B. Second-order spectra: Franck-Condon effect…”

Picosecond Spin Seebeck Effect

“…A description of the experimental setup can be found in the Supplemental Material [32] including Refs. [39][40][41][42][43][44][45][46][47][48].…”

Nonlinear optical spectroscopy of epitaxial magnetic garnet films

“…In its middle part Fig. 1 shows experimentally observed transition energies in YIG as reported in several papers [5,6,[9][10][11][12][13][14][15]. The electronic structure of iron garnets has been a subject of calculations based on crystal field theory and molecular orbital theory [5,9,14,[16][17][18].…”