Journal ArticleDOI
Magnetic Anisotropy from Exchange Interaction and Magnetic Structure of CoO
Osamu Nakanishi,Takemi Yamada +1 more
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In this article, it is shown that the spin axes can tilt by a large angle only in the collinear structure in virtue of a cancellation of the two contributions, one from the tetragonal deformation of the lattice and the other from the kinetic exchange.Abstract:
The problem of alternative magnetic structure in CoO, the collinear structure or the multi-spin-axis structure, is discussed in connection with the origin of the large tilt angle of spin axes observed by neutron diffraction. Magnetic anisotropy energies from the orbital-momentum dependent exchange interaction in the two model structures are estimated and compared with the other contributions from Kanamori's mechanisms. It is shown that the spin axes can tilt by a large angle only in the collinear structure in virtue of a cancellation of the two contributions, one from the tetragonal deformation of the lattice and the other from the kinetic exchange. The situation is reversed in the multi-spin-axis structure. The multi-spin-axis model is therefore rejected from a theoretical point of view.read more
Citations
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Probing the exchange bias in Co/CoO nanoscale antidot arrays using anisotropic magnetoresistance
D. Tripathy,A. O. Adeyeye +1 more
TL;DR: The dependence of exchange bias in polycrystalline Co/CoO nanoscale antidot arrays on temperature and Co layer thickness has been systematically probed using the anisotropic magnetoresistance technique.
Journal ArticleDOI
Exchange bias in a columnar nanocrystalline Ni80Fe20/CoO thin film
J. van Lierop,B. W. Southern,Ko-Wei Lin,Z.-Y. Guo,C. L. Harland,Richard A. Rosenberg,John W. Freeland +6 more
TL;DR: In this paper, the effects of interfacial coupling at the boundary of ferromagnetic and antiferromagnetic components in a nanoscale columnar-structured thin film have been examined.
Journal ArticleDOI
59Co NMR in an Antiferromagnetic CoO Single Crystal
Okada Kunihide,Yasuoka Hiroshi +1 more
TL;DR: In this article, the authors investigated the angular dependence of the NMR spectra in CoO single crystal in the antiferromagnetic state under an external magnetic field, and the observed value of the hyperfine field at 59 Co nucleus in zero external field was found to be +4953±05 kOe at 42 K.
Journal ArticleDOI
A low-temperature powder neutron diffraction study of the antiferromagnetic phase of MnxCo1−xO
D.A.O. Hope,A.K. Cheetham +1 more
TL;DR: In this article, high-resolution powder neutron diffraction measurements have been used to study the crystallographic and magnetic properties of antiferromagnetic MnxCo1−xO. Both the lattice and magnetic parameters reveal three distinct regions of behavior across the range of composition, which can be attributed to changes in the relative proportions of Co2+ ions adopting the alternative 4A2g and 4Eg ground states.
Journal ArticleDOI
Antiferromagnetic resonance in CoO/NiO mixed crystals
TL;DR: In this paper, the lowest magnetic excitation of Ni 1− x Co x O mixed crystals for 0.94⩽ x ⩽1.07 and neutron data for x = 0.14 and x =0.30 were studied by means of a model, especially the variation of AFMR frequency and preferred spin direction with Co concentration.
References
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Journal ArticleDOI
Simplified LCAO Method for the Periodic Potential Problem
John C. Slater,G. F. Koster +1 more
TL;DR: In this paper, the LCAO interpolation method was used as an interpolation technique in connection with more accurate calculations made by the cellular or orthogonalized plane-wave methods.
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Electronic Structure of the 3d Transition-Metal Monoxides. I. Energy-Band Results
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Theory of the Magnetic Properties of Ferrous and Cobaltous Oxides, I
TL;DR: In this article, the magnetic properties of antiferromagnetics, FeO and CoO, were investigated from the standpoint of the one-ion approximation, and the authors derived the effective Hamiltonian for these degenerate cases, which corresponds to the Hamiltonian derived by Pryce for the non-degenerate case, and discussed the magnetic susceptibility, the NEE! temperature and the state of each ion at absolute zero.
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Optical Absorption Study of Co‐Doped Oxide Systems. II
TL;DR: In this paper, the optical absorption spectra of several Co-doped oxide systems (MgO, ZnO, aluminum spinel, yttrium gallium garnet, and germanium garnets) have been studied at room temperature, 78°, and 4.2°K, and analyzed using the formalism of the crystal field theory.
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A note on the structure of nickel oxide at subnormal and elevated temperatures
TL;DR: In a previous communication (Rooksby, 1943) it was reported that critical examination of X-ray powder photographs of nickel oxide disclosed a departure of the crystal structure from cubic symmetry as mentioned in this paper.