First-Principles Theory and Predictions of the Kerr Effect

Oppeneer, Peter M.; Antonov, V. N.; Yaresko, A. N.; Perlov, A. Ya.; Kraft, Thomas; Eschrig, H.

doi:10.3379/jmsjmag.20.s1_47

Cited by 16 publications

(15 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The solid curves show the case when the polarization vector is parallel to a main crystal axis. The optical response is similar to the polar MOKE of hcp 0001 Co 23,24 . To a good approximation it can be regarded as a common polar MOKE response without birefringence.…”

Section: B Optical Response Of the Single Crystalsupporting

confidence: 53%

See 1 more Smart Citation

Polar magneto-optical Kerr effect for low-symmetric ferromagnets

et al. 2005

View full text Add to dashboard Cite

The polar magneto-optical Kerr effect (MOKE) for low-symmetric ferromagnetic crystals is investigated theoretically based on first-principle calculations of optical conductivities and a transfer matrix approach for the electrodynamics part of the problem. Exact average magneto-optical properties of polycrystals are described, taking into account realistic models for the distribution of domain orientations. It is shown that for low-symmetric ferromagnetic single crystals the MOKE is determined by an interplay of crystallographic birefringence and magnetic effects. Calculations for single and bi-crystal of hcp 1120 Co and for a polycrystal of CrO 2 are performed, with results being in good agreement with experimental data.

show abstract

Section: B Optical Response Of the Single Crystalsupporting

confidence: 53%

“…(31) Results of standard electronic structure calculations are for both systems tensors of the form 12,23,24 (see also Secs. VI A,VII A)…”

Section: Symmetry Considerationsmentioning

confidence: 99%

Polar magneto-optical Kerr effect for low-symmetric ferromagnets

et al. 2005

View full text Add to dashboard Cite

show abstract

“…In particular, they are two orders of magnitude larger than that (∼ 5 µeV/atom) of elemental ferromagnets Fe and Ni [53]. They are also comparable to that of layered heavy element magnetic alloys such as FePt and CoPt [54] which have the largest MAEs among magnetic transition metal alloys. Because of the appreciable out-of-plane anisotropy, all the Cr 2 Ge 2 Te 6 materials except the ML, could have possible applications in high density magnetic data storage.…”

Section: A Magnetic Moments and Exchange Couplingmentioning

confidence: 99%

Large magneto-optical effects and magnetic anisotropy energy in two-dimensional Cr2Ge2Te6

Fang¹,

Wu²,

Zhang³

et al. 2018

Phys. Rev. B

147

View full text Add to dashboard Cite

Atomically thin ferromagnetic (FM) films were recently prepared by mechanical exfoliation of bulk FM semiconductor Cr2Ge2Te6. They provide a platform to explore novel two-dimensional (2D) magnetic phenomena, and offer exciting prospects for new technologies. By performing systematic ab initio density functional calculations, here we study two relativity-induced properties of these 2D materials [monolayer (ML), bilayer (BL) and trilayer (TL) as well as bulk], namely, magnetic anisotropy energy (MAE) and magneto-optical (MO) effects. Competing contributions of both magneto-crystalline anisotropy energy (C-MAE) and magnetic dipolar anisotropy energy (D-MAE) to the MAE, are computed. Calculated MAEs of these materials are large, being in the order of ∼0.1 meV/Cr. Interestingly, we find that the out-of-plane magnetic anisotropy is preferred in all the systems except the ML where an in-plane magnetization is favored because here the D-MAE is larger than the C-MAE. Crucially, this explains why long-range FM order was observed in all the few-layer Cr2Ge2Te6 except the ML because the out-of-plane magnetic anisotropy would open a spin-wave gap and thus suppress magnetic fluctuations so that long-range FM order could be stabilized at finite temperature. In the visible frequency range, large Kerr rotations up to ∼1.0 • in these materials are predicted and they are comparable to that observed in famous MO materials such as PtMnSb and Y3Fe5O12. Moreover, they are ∼100 times larger than that of 3d transition metal MLs deposited on Au surfaces. Faraday rotation angles in these 2D materials are also large, being up to ∼120 deg/µm, and are thus comparable to the best-known MO semiconductor Bi3Fe5O12. These findings thus suggest that with large MAE and MO effects, atomically thin Cr2Ge2Te6 films would have potential applications in novel magnetic, MO and spintronic nanodevices. *

show abstract

“…Ising anisotropy is known to occur in 1D metalorganic compounds (e.g., [32]) and also in transition metal oxides containing chain structures [33], but there is not a single 3D metallic material known that exhibits such an extreme Ising anisotropy as computed here for URu 2 Si 2 . For comparison, the magnetically most anisotropic material with itinerant electrons is presently FePt [34] which moreover, crystallizes in the simple tetragonal structure too, with equilibrium moments along c. However, the calculated Fe total moment is hardly anisotropic (2.863 µ B vs. 2.857 µ B for µ along (001) and (110), respectively, see [35]), stipulating that the magnetic behavior is more Heisenberg than Ising-like. Thus FePt is consistent with the observation in Refs.…”

mentioning

confidence: 99%

Exceptional Ising magnetic behavior of itinerant spin-polarized carriers inURu2Si2

et al. 2014

View full text Add to dashboard Cite

We show on the basis of electronic structure calculations that the uranium 5f magnetic moment in URu2Si2 exhibits a unique Ising behavior, which surprisingly, arises from itinerant electronic states. The origin of the unusual Ising behavior is analyzed as due to the peculiar near-Fermi edge nested electronic structure of URu2Si2 involving its strong spin-orbit interaction. The Ising anisotropy has pertinent implications for theories applicable to explaining the Hidden Order phase in URu2Si2. PACS numbers: 71.28.+d,75.30.Gw The origin of the "Hidden Order" (HO) phase emerging below T 0 = 17.5 K in the uranium-based heavy-fermion compound URu 2 Si 2 has remained a mystery even after more than a quarter century of intensive investigations (see, e.g., Ref.[1] for a recent review). This second-order phase transition appears unmistakably in the thermodynamic and transport properties [2][3][4], yet local solidstate probes such as x rays, neutron scattering, NMR or µSR fail to give a clue for the emerging order parameter. Long-range ordered (dipolar) magnetism has been excluded as a cause for the "hidden order" (HO), but in close proximity to the HO phase a long-range ordered antiferromagnetic phase exists, which is stabilized through only a small pressure of ∼ 0.5 GPa [5].Multifarious theories have been proposed to explain the intriguing appearance of the HO phase, see [1] and [6] for an overview. Since the actinide 5f electrons can, in general, assume localized or itinerant character, correspondingly theories adopting localized 5f behavior have been proposed (e.g., [6][7][8][9][10][11]) as well as competing theories based on the assumption of itinerant 5f behavior (e.g., [12][13][14][15][16][17][18][19][20]). In several of the latter models the existence of a Fermi surface instability is typically connected to appearance of an unconventional density wave [17,18], a spin resonance mode [13] or hybridization wave [14] that triggers formation of a Fermi surface gap. Theories based on localized 5f states often elaborate from a mainly localized 5f 2 configuration possibly with some hybridization with conduction electrons [6,11].Experimental evidence in favor of either localized or itinerant 5f behavior is unquestionably crucial. Recent quantum oscillation measurements [21,22] have drawn attention to a previously unrecognized aspect of the HO quasiparticles in URu 2 Si 2 , namely, their extreme Ising character. From the angular dependence of the de Haasvan Alphen amplitudes [23] a g-factor anisotropy g c /g a , along the c and a crystallographic axes, was estimated to exceed 30, implying that HO emerges out of quasiparticles with giant Ising anisotropy [21,22]. This feature has become salient in the quest for understanding the exotic HO and its concomitant superconductivity [6,24]. The Ising behavior of the near Fermi-energy quasiparticles nicely supports the picture of localized 5f states in URu 2 Si 2 , possibly having a small hybridization with conduction electrons [21,22]. This extreme magnetic anisotropy is a cent...

show abstract

First-Principles Theory and Predictions of the Kerr Effect

Cited by 16 publications

References 34 publications

Polar magneto-optical Kerr effect for low-symmetric ferromagnets

Polar magneto-optical Kerr effect for low-symmetric ferromagnets

Large magneto-optical effects and magnetic anisotropy energy in two-dimensional Cr2Ge2Te6

Exceptional Ising magnetic behavior of itinerant spin-polarized carriers inURu2Si2

Contact Info

Product

Resources

About