First-principles calculations of the magneto-optical Kerr effect in L10-type ordered alloys TM–X

Yamaguchi, Masatake; Kusakabe, T.; Kyuno, Kentaro; Asano, Setsuro

doi:10.1016/s0921-4526(99)00169-6

Cited by 12 publications

(4 citation statements)

References 38 publications

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“…The Co-Pt alloy phase diagram reveals a continuous series of solid solution with the ferromagnetic order over nearly the whole range of concentrations 1 with three well-established ordered phases: CoPt known as the tetragonal L1 0 structure and CoPt 3 (Co 3 Pt) with the cubic L1 2 structure. Many experimental and theoretical studies have been done especially for the ordered alloys [2][3][4][5][6][7][8][9][10][11][12][13][14] and it is established that the large magneto-optical Kerr effect ͑MOKE͒ of the Co-Pt systems is caused by an interplay between the exchange splitting of Co and the spin-orbit ͑SO͒ coupling of Pt in the hybridized bands. 6 To understand deeper how the spin-orbit coupling and the exchange splitting work in the systems when the alloy composition changes in a wide range, a detailed analysis of the band structure evolution is desirable.…”

Section: Introductionmentioning

confidence: 99%

Microscopic origin of the magneto-optical properties of CoPt alloys

Uba

Antonov

et al. 2001

Phys. Rev. B

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The microscopic origin of the magneto-optical ͑MO͒ properties of Co x Pt 1Ϫx alloys is studied on the basis of Kerr effect measurements and first-principles band-structure calculations in a wide range of photon energy (បϭ0.75-5.8 eV) and Co content (xϭ0.03-0.5). Spin-polarized relativistic linear-muffin-tin-orbital ͑LMTO͒ calculations performed within the local density approximation and supercell approach reproduce well the spectral shape of the measured off-diagonal optical conductivity tensor components. Using the ab initio LMTO band-structure calculations, the band-by-band and k-space decompositions as well as the analysis of the magneto-optical transitions between electronic states localized in different energy regions are performed. It is found that for the alloys studied the uv part of the MO spectra with a pronounced peak at 4 eV photon energy comes from optical transitions between initial and final states located within well-defined energy intervals that are very close to those obtained for fcc Pt metal in external magnetic field. The correlation between the band structure of the alloys and the energy dependence of their MO spectra is investigated. The importance of the spin-orbit interaction for the transitions in different energy regions is demonstrated by calculating the state-and site-projected density of the expectation value of the orbital moment. The evolution of the electronic structure of Co-Pt alloys with the increase of Co content and the influence of the hybridization between the Co and Pt electronic states are analyzed and discussed.

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Section: Introductionmentioning

confidence: 99%

Microscopic origin of the magneto-optical properties of CoPt alloys

Uba

Antonov

et al. 2001

Phys. Rev. B

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“…Fortunately, the chemically ordered L1 0 -FePt film has a large MOKE and a high perpendicular magnetic anisotropy. [5][6][7]30] With spin-polarized Pt atoms and a large spin-orbital coupling, the chemically ordered L1 0 -FePt alloy shows a broad and bell-shaped dispersion structure in the magneto-optical polar Kerr rotation θ K spectrum in the 2.0-4.8 eV region. [9] Accordingly, a high spectral sensitivity cannot be obtained in the visible region.…”

Section: Introductionmentioning

confidence: 99%

“…It is noted that although the bulk plasma resonance enhanced MOKE may occur, [10][11][12] the plasma edge in L1 0 -FePt films is not located in the visible region. [7] In the past decades, subwavelength optics in nanostructures has attracted much attention because of its wide applications in optical devices. [13][14][15] The electromagnetic field can be redistributed by surface plasma polariton (SPP) excitation.…”

Section: Introductionmentioning

confidence: 99%

The subwavelength tuned magneto-optical Kerr effect in L1 ₀ -FePt films with perpendicular magnetic anisotropy

Zhang

Shi

et al. 2013

Chinese Phys. B

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We report the large polar magnetooptical Kerr effect in L10-MnxGa (0.76 ≤ x ≤ 1.29) epitaxial films with giant perpendicular magnetic anisotropy. The Kerr rotation is enhanced by a factor of up to 2.5 by decreasing Mn atomic concentration, which most likely arises from the variation of the effective spin-orbit coupling strength, compensation effect of magnetic moments at different Mn atom sites, and overall strain. A significant tuning effect of composition is also observed on Kerr ellipticity and complex Kerr angle (including the magnitude and phase angle). The good epitaxial compatibility with semiconductors, moderate coercivity of 4.6-9.7 kOe, large Kerr rotation of up to 0.10 o , high reflectivity of 35%-55% in a wide wavelength range of 400~850 nm, and giant magnetic anisotropic field of up to 140 kOe together make these L10-MnxGa films promising for scientific and technological applications in spintronics and terahertz-frequency magnetooptical modulators. 1. Introduction The polar magneto-optical (MO) Kerr effect is a powerful tool that can locally probe the magnetic properties and electronic structures of materials [1] and modulate the optical polarization at the spin precession frequency [2]. Most recently, a variety of new exciting spintronic phenomena have been observed taking advantage of the polar MO Kerr effect, such as voltage-controlled magnetic anisotropy in ferromagnetic thin films [3], broken time-reversal symmetry in the heavy-fermion superconductors and bilayer graphene [4,5], terahertz spin precession in perpendicularly magnetized Mn3Ge films [6], spin Hall effect in semiconductors [7], magnetic skyrmion bubbles [8], magnetic vortex dynamics [9], spin orbit torques [10], and nanosecond current-induced domain wall motion [11] in ferromagnet/heavy metal bilayers and nanowires. From the viewpoint of technological application, high-speed optic communication requires modulators of light magnitude/polarization working at very high frequencies. For MO modulators, the conventional ferromagnetic materials, e.g. Permalloy, usually have very weak magnetic anisotropy which limits the modulation bandwith to a few GHz or less [2]. MO materials with giant magnetic anisotropic field (Hk) of ~100 kOe, e.g. Mn3Ge [6], are good candidates for ultrafast MO modulators due to their terahertz-frequency spin precession, which is at least two orders of magnitude faster than that based on conventional ferromagnetic materials [2]. Furthermore, MO materials epitaxially compatible with semiconductors allow for direct integration of MO functional devices with underlying photonic circuits. Therefore, for both the spintronic and modulator applications [6-11], it is highly desirable to develop new kinds of MO materials which simultaneously have large saturation Kerr rotation (θK), high optical reflectivity (R), giant Hk, and good semiconductor compatibility, and to further tailor their MO properties. In past two decades, the noble-metal-free and rare-earth-free MnxGa alloys with giant uniaxial magnetic

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“…An ab initio band calculation by Yamaguchi et al provides theoretical support for the experimental findings. 7 In our previous work, we measured the MSHG of Fe/Au superlattices modulated by integer atomic layers and observed strong MSHG signals, the azimuthal pattern of which shows a prominent four-fold symmetry reflecting that of the substrate. 8 The azimuthal pattern was qualitatively explained in terms of combination of electric quadrupole for the nonmagnetic term and electric dipole for magnetic term.…”

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confidence: 95%

Nonlinear magneto-optical effect in Fe/Au superlattices modulated by noninteger atomic layers

Sato

Kodama

Miyamoto

et al. 2000

Journal of Applied Physics

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Magnetic second harmonic generation (MSHG) signals from the Fe/Au superlattices grown on MgO (100) substrate have been investigated. The measurements were carried out in the longitudinal Kerr geometry with a 45° incidence. The magnetic field of ±0.2 T was applied to provide a magnetic saturation. The polar plot of azimuth dependence of the MSHG intensity showed a four-fold symmetry pattern similar to that observed in Fe/Au superlattices modulated by integer atomic layers. Azimuthal patterns show 45° rotation by reversing the magnetic field. Nonlinear Kerr rotation angle of 23.2° was observed in the x=3.75 superlattice.

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First-principles calculations of the magneto-optical Kerr effect in L10-type ordered alloys TM–X

Cited by 12 publications

References 38 publications

Microscopic origin of the magneto-optical properties of CoPt alloys

Microscopic origin of the magneto-optical properties of CoPt alloys

The subwavelength tuned magneto-optical Kerr effect in L1 ₀ -FePt films with perpendicular magnetic anisotropy

Nonlinear magneto-optical effect in Fe/Au superlattices modulated by noninteger atomic layers

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First-principles calculations of the magneto-optical Kerr effect in L10-type ordered alloys TM–X

Cited by 12 publications

References 38 publications

Microscopic origin of the magneto-optical properties of CoPt alloys

Microscopic origin of the magneto-optical properties of CoPt alloys

The subwavelength tuned magneto-optical Kerr effect in L1 0 -FePt films with perpendicular magnetic anisotropy

Nonlinear magneto-optical effect in Fe/Au superlattices modulated by noninteger atomic layers

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The subwavelength tuned magneto-optical Kerr effect in L1 ₀ -FePt films with perpendicular magnetic anisotropy