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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Physics and Chemistry of Solids 49 (1988), S. 975-980 
    ISSN: 0022-3697
    Keywords: Crystal-field analysis ; crystal field ; neodymium gallium garnet energy levels ; paramagnetic susceptibility ; spin-correlated crystal field
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Chemical Physics Letters 125 (1986), S. 290-294 
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5985-5987 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Faraday rotation (FR) of scandium substituted holmium iron garnets single crystals Ho3Fe5-zSczO12 (z=0.35, 0.52, 0.56, and 0.73) has been investigated at 1152 nm wavelength in the 6 K〈T〈TNéel temperature range and magnetic field up to 20 kOe applied along the [111] easy axis. At this wavelength, in a narrow concentration range (0.5〈z〈0.6), in addition to the classic magnetic compensation temperature Tcomp, the spontaneous FR Φs(T, z=Cte) curves present two magneto-optic (MO) compensation points TMOComp(1) and TMOComp(2) where the FR vanishes although the ferrite magnetization is different from 0. When z(approximately-greater-than)0.6, only TMOComp(1) remains. These results, due to the influence of the diamagnetic dilution of the octahedral [a] Fe3+ sublattice, are interpreted using the one ion FR model of Crossley et al. and the Dionne-refined Néel model of garnets. They give an indirect experimental confirmation of the temperature dependence of the MO electric dipole coefficient Ce(λ=1152 nm, T), and of the preponderance of the (d)−{c} magnetic interactions compared to the [a]−{c} ones. © 1996 American Institute of Physics.
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6792-6794 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetization and Faraday rotation measurements at 1152 nm have been performed on Ho3Fe5−zAlzO12 (z=0.45) single crystals as a function of temperature and magnetic field oriented along the 3 crystallographic axes [100], [110], and [111] in both experiments. A strong anisotropy is observed at low temperature (T〈100 K), although the Faraday susceptibility remains anisotropic until Tcomp=185 K. High field magnetization measurements (H up to 200 kOe) show that the FR anisotropy is mainly of magnetic origin. The results are interpreted on the basis of the Dionne-refined Néel model of ferrimagnetic garnets using a field dependent canting angle.
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  • 5
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6103-6105 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Dysprosium iron garnet Dy3Fe5O12 (DyIG) thin films have been synthesized by postoxidizing at a temperature Tox (400 °C〈Tox〈1100 °C) of rf sputtered amorphous Dy-Fe metallic films. The sputtering conditions strongly influence the growth, the composition and magnetic and magneto-optic properties of the oxidized films. Pure DyIG films, free of DyFeO3, are synthesized at Tox∼1000 °C. Magnetic and Faraday rotation (FR) experiments at three wavelengths (543.5, 632.8, and 1152 nm) were performed on DyIG films in the 4–300 K temperature range, as a function of magnetic field up to 20 kOe perpendicular to the film plane. Magnetization and FR data are in good agreement with results obtained on bulk DyIG materials. Temperature dependent coercivity is observed with a discontinuity in the vicinity of the compensation temperature (Tcomp∼225 K). The temperature variations of the spontaneous FR values for the three wavelengths are interpreted on the basis of contributions proportional to the magnetization of each sublattice.
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4571-4573 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Faraday rotation measurements, performed at 1150 nm wavelength on single-crystal platelets of CoFe2O4 with two different crystallographic orientations [100] and [111], are presented under magnetic fields up to 20 kOe, in the 5–580-K temperature range. A high anisotropy of magnetic origin is observed particularly at low temperatures (T〈230 K) where saturation cannot be obtained along the [111] direction in a 20-kOe magnetic field. The high Faraday rotation measured at 1150 nm and 300 K (−5700°/cm) is about twice that of Bi-substituted garnet films at this wavelength. The results are interpreted on the basis of contributions proportional to the magnetization of each magnetic sublattice.
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5214-5216 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic properties of garnet single crystals Er3Fe5−zSczO12 (z=0.10 and 0.30) are reported under high magnetic field up to 264 kOe in the 2–320 K temperature range. Below the compensation temperature Tcomp (71 and 52 K for z=0.10 and 0.30, respectively), in the spontaneous state, the magnetic anisotropy is very weak for z=0.10 and more important for z=0.30. The "easy" axis is [100] for both Sc concentrations as in pure ErIG. These results are compared to Faraday rotation anisotropy. From the analysis of the temperature dependences of the spontaneous magnetizations, the molecular field coefficient Ndc related to the Fe–Er superexchange interactions has to be, as are Ndd and Nad, a function of z. In the high magnetic field and at low temperature, the onset of the usual canted magnetic phase takes place for H applied parallel to the "easy" [100] axis for both concentrations, whereas an unusual behavior is observed for z=0.30 and H parallel to [111] direction: below 30 K, three temperature dependent field induced transitions are observed. © 1999 American Institute of Physics.
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6256-6258 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magneto-optical (MO) properties of Er3Fe5−zAlzO12 (z=0.35 and 0.55) single crystals, where Al3+ ions show a large preferentially tetrahedral Fe3+ replacement, are presented and compared to those of pure ErIG and octahedrally substituted ErIG:Sc compounds. Faraday rotation (FR) Φ measurements at 1152 nm wavelength were performed in the 6–600 K temperature range under a magnetic field up to 20 kOe applied parallel to the [100] and [111] crystallographic axes of the "as-grown" crystals. For both Al concentrations, within experimental accuracy, the measured anisotropy of the spontaneous FR is weak (less than 10%) or absent. Sample with z=0.35 is nearly isotropic. In contrast to ErIG:Sc, the FR susceptibility χF(T)=dΦ/dH deduced from the saturated part of the different FR curves shows no anisotropy. The analysis of the MO properties of the compounds is performed using the one ion model and assuming the total Fe3+ MO contribution is represented by the magnetooptical measurements performed on YIG:Al single crystals of same composition. The temperature variation of the Er3+ FR contribution ΦEr shows that the FR due to magnetic dipole transitions compensates the electric dipole contribution when T/TNéel∼0.13, and is not affected by diamagnetic tetrahedral (Al3+) or octahedral (Sc3+) Fe3+ substitutions. The magneto-optical electric dipole coefficient Ce of the Er sublattice is also shown to be a function of temperature. © 2000 American Institute of Physics.
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  • 9
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3265-3267 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Faraday rotation (FR) measurements performed on single-crystal ytterbium gallium garnet (YbGG) at 0.6328- and 1.15-μm wavelengths are presented in a magnetic field up to 20 kOe applied along the three main crystallographic directions and in the 6–300 K temperature range. At 0.6328 μm, the FR is proportional to the magnetic field and a strong anisotropy of the Verdet constant (V) is evidenced below 50 K. The FR in the infrared does not present a linear field dependence but V is isotropic. Accurate magnetic susceptibility measurements are reported on the same samples in identical H-T conditions. The temperature dependence of the Faraday rotation susceptibility differs strongly from that of the magnetic susceptibility. The results are briefly analyzed in terms of electric dipole transitions.
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  • 10
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5981-5983 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of diamagnetic cation migration on magneto-optical (MO) properties has been studied on single crystals of garnets Gd3Fe5−zAlzO12 (0.3〈z〈1.3) quenched at two different temperatures Tq = 1297 and 1473 K. Faraday rotations (FR) were performed at 1150 nm from 5 K to the Curie temperature in an applied magnetic field up to 20 kOe. The influence of Tq on the Faraday rotation is important in the narrow region of the magnetic compensation temperature Tcomp which is shifted towards lower temperatures when Tq increases. In contrast, quenching experiments have little noticeable effect on the MO compensation temperature and the absolute FR values. These FR results are interpreted on the basis of the model of Crossley et al. [Phys. Rev. 181, 896 (1969)] where the sublattice magnetizations and the magneto-optical coefficients take into account the cationic distribution in a and d sites of the garnet due to heat treatments. At low temperatures, the contribution of Gd3+ to FR is predominantly due to magnetic dipole transitions.
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