Optical Faraday effect in ferromagnetic and ferrite films

Coren, R. L.; Francombe, M. H.

doi:10.1051/jphys:01964002501-2023300

Cited by 25 publications

(5 citation statements)

References 11 publications

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“…At j = 1000 A/cm 3 , ∆ρ is about five orders of magnitude smaller than the spontaneous Faraday rotatory power of bcc Fe [32]. This is the same difference in orders of magnitude that was found in the previous section for the AHC.…”

Section: Kinetic Faraday Effectsupporting

confidence: 79%

“…This is the same difference in orders of magnitude that was found in the previous section for the AHC. However, the smallness of the kFE is compensated by the high transparency of Te in the infrared, which allows one to measure the optical rotation across a cm-sized sample [4,5], compared to ∼ 10 −6 cm-thick iron films [32]. The open circles denote experimental data [33,34] taken at Na = 3.2 · 10 16 cm −3 , which has been rescaled by a factor of 1/2 for comparison purposes.…”

Section: Kinetic Faraday Effectmentioning

confidence: 99%

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Gyrotropic effects in trigonal tellurium studied from first principles

2018

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We present a combined ab initio study of several gyrotropic effects in p-doped trigonal tellurium (effects that reverse direction with the handedness of the spiral chains in the atomic structure). The key ingredients in our study are the k-space Berry curvature and intrinsic orbital magnetic moment imparted on the Bloch states by the chirality of the crystal structure. We show that the observed sign reversal with temperature of the circular photogalvanic effect can be explained by the presence of Weyl points near the bottom of the conduction band acting as sources and sinks of Berry curvature. The passage of a current along the trigonal axis induces a rather small parallel magnetization, which can nevertheless be detected by optical means (Faraday rotation of transmitted light) due to the high transparency of the sample. In agreement with experiment, we find that when infrared light propagates antiparallel to the current at low doping the current-induced optical rotation enhances the natural optical rotation. According to our calculations the plane of polarization rotates in the opposite sense to the bonded atoms in the spiral chains, in agreement with a recent experiment that contradicts earlier reports.

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Section: Kinetic Faraday Effectsupporting

confidence: 79%

Section: Kinetic Faraday Effectmentioning

confidence: 99%

Gyrotropic effects in trigonal tellurium studied from first principles

2018

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“…This is particularly true if an additional phase was present in a crystalline form in small amounts with concomitant low Raman scattering intensity or in a disordered form with concomitant broad, unresolved Raman features. However, because the estimated corrosion layer thickness, less than Ϸ100 nm on both coupons, is less than the penetration depth of 647.1 nm radiation in the NiFe 2 O 4 phase, Ϸ1000 nm 38 with a corresponding Raman probe depth of Ϸ500 nm ͑the Raman scattered radiation must escape without being absorbed͒, it is likely that if an additional crystalline phase were present at appreciable concentrations it would have been detected.…”

Section: C110mentioning

confidence: 93%

Alloy 600 Aqueous Corrosion at Elevated Temperatures and Pressures: An In Situ Raman Spectroscopic Investigation

Maslar

Hurst

Bowers

et al. 2009

J. Electrochem. Soc.

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Two alloy 600 coupons with different surface treatments were exposed in an optically accessible flow cell to air-saturated, high-purity water: one coupon at temperatures up to 543°C at a pressure of 25.4MPa and one coupon at temperatures up to 392°C at 15.65MPa . In situ Raman spectra were collected at various temperatures as each coupon was heated and then cooled. Each coupon was also characterized ex situ with Raman spectroscopy, scanning electron microscopy, and energy dispersive X-ray spectrometry. A NinormalFe2normalO4 phase was identified on both coupon surfaces while CrIII -containing phases, including α-CrOOH and α-normalCr2normalO3 , were identified only on the coupon exposed at higher temperatures, at a higher pressure, and with a rougher surface finish. In addition, the results from the alloy 600 coupon exposed at higher temperatures and a 304L stainless steel coupon exposed under nominally identical conditions were compared. Both NinormalFe2normalO4 and α-CrOOH phases were observed on the 304L stainless steel coupon. In general, in situ Raman spectroscopy was found to be sensitive to differences in alloy 600 corrosion processes attributed to different surface treatments and differences in alloy 600 and 304L stainless steel corrosion processes attributed to the different oxidation resistance of each alloy.

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“…The coercive force Hc obtained from either one of these curves is about a hundred times larger than that of bulk nickel (0.7 G). Large coercive forces are often measured in very thin films and have been related to size effects [8]. However, the coercive forces measured on coated nanocrystalline nickel have been shown to be smaller than that of bulk nickel [7] indicating that the origin of the large value measured in our case is related to strains arising from both the lattice mismatch and compressive thermal stresses rather than from size effects.…”

Section: Resultsmentioning

confidence: 56%

A new approach to the fabrication of “smart” near-surface nanostructure composites

et al. 1997

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A new method for the formation of “smart” near-surface nanoscale composites has been developed. In this approach, small precipitates of active phases are embedded in the near-surface region of the material that is to be modified by a combination of ion implantation and thermal processing. The dispersion, concentration, and microstructure of the nanocrystals formed in the substrate material can be tailored through a careful choice of processing parameters – making this approach well suited to high-value-added, high-technology applications. The applicability of this approach to forming “smart” surfaces on otherwise inactive materials was established in the case of VO2 precipitates which were embedded in A12O3 single crystals to create a medium suitable for optical applications – including optical data storage. Most recently, this concept has been extended to the fabrication of magnetic-field-sensitive nanostructured surfaces by forming magnetostrictive precipitates of materials such as Ni or RFe2 (with R = Tm, Tb, Sm) that are embedded in various single-crystal-oxide hosts. These nanostructured, active surface composites have been characterized using XRD, RBS, TEM, and magneto-optical techniques.

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Optical Faraday effect in ferromagnetic and ferrite films

Cited by 25 publications

References 11 publications

Gyrotropic effects in trigonal tellurium studied from first principles

Gyrotropic effects in trigonal tellurium studied from first principles

Alloy 600 Aqueous Corrosion at Elevated Temperatures and Pressures: An In Situ Raman Spectroscopic Investigation

A new approach to the fabrication of “smart” near-surface nanostructure composites

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