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Magnetic structure

About: Magnetic structure is a research topic. Over the lifetime, 10787 publications have been published within this topic receiving 207143 citations.


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TL;DR: In this paper, a description of preliminary work showing the ability of the scanning electron microscope to resolve magnetic surface detail is given, showing domain structures on two perpendicular faces of a cobalt crystal, and also a direct observation of recordings on magnetic tape.
Abstract: A description is given of preliminary work showing the ability of the scanning electron microscope to resolve magnetic surface detail. The magnetic fields influence the secondary electron signal directly so that colloid patterns (Bitter technique) are eliminated and the actual fields, rather than the rate of change of field, determine the picture observed. Micrographs are included showing domain structures on two perpendicular faces of a cobalt crystal, and also a direct observation of recordings on magnetic tape. Apart from its application to the study of magnetic structure, the technique offers a convenient method of very accurate calibration (approaching 0.1% with care) by using a magnetic strip alongside a specimen under observation.

55 citations

Journal ArticleDOI
TL;DR: In this article, the first principles of density functional theory have been applied to the structure of Ni2XGa and Ni2MnGa, and the lattice parameters of both austenitic and martensitic phases have been calculated using the VIENNA AB INITIO software package.
Abstract: The crystallographic, magnetic and electronic structures of the ferromagnetic shape memory alloys Ni2XGa (X=Mn, Fe, and Co), are systematically investigated by means of the first–principles calculations within the framework of density functional theory using the VIENNA AB INITIO SOFTWARE PACKAGE. The lattice parameters of both austenitic and martensitic phases in Ni2MnGa have been calculated. The formation energies of the cubic phase of Ni2XGa are estimated, and show a destabilization tendency if Mn atom is substituted by Fe or Co. From Ni2MnGa to Ni2CoGa, the down spin total density of states (DOS) at Fermi level is gradually increasing, whereas that of the up spin part remains almost unchanged. This is the main origin of the difference of the magnetic moment in these alloys. The partial DOS is dominated by the Ni and Mn 3d states in the bonding region below EF. There are two bond types existing in Ni2XGa: one is between neighboring Ni atoms in Ni2MnGa; the other is between Ni and X atoms in Ni2FeGa and ...

55 citations

Journal ArticleDOI
TL;DR: In this paper, it was shown that the powder data cannot indicate an unambiguous magnetic structure, but the magnitude of the ordered moment can be fixed The rms moments associated with ordering of the first and second kinds are 10 and 060 µ� B per nickel atom, respectively, and the total moment is 117 µ� B per Nickel atom.
Abstract: The transition metal dichalcogenides exhibit a wide variety of both electrical and magnetic properties, from insulators to superconductors and from ferromagnetism through antiferromagnetism to diamagnetism NiS 2 is a semiconductor with an anomalous paramagnetic behavior which leaves in doubt the existence of a local moment Previous neutron diffraction data have failed to show any ordering down to 42°K Our neutron powder diffraction data on stoichiometric NiS 2 show a transition at 40°K to a structure which can be described as ordering of the first kind This is followed by an abrupt transition at 30°K in which additional diffraction peaks appear and these are consistent with ordering of the second kind Despite the fact that the powder data cannot indicate an unambiguous magnetic structure, the magnitude of the ordered moment can be fixed The rms moments associated with ordering of the first and second kinds are 10 and 060 µ B per nickel atom, respectively, and the total moment is 117 µ B per nickel atom

55 citations

Journal ArticleDOI
TL;DR: The results of elastic, quasielastic, and inelastic neutron-scattering studies on polycrystalline CeM 2 Ge 2 (M=Ag, Au, and Ru) reveal long-range magnetic order at low temperatures.
Abstract: The results of elastic, quasielastic, and inelastic neutron-scattering studies on polycrystalline CeM 2 Ge 2 (M=Ag, Au, and Ru) are presented. All compounds reveal long-range magnetic order at low temperatures. Ferromagnetic (M=Ru), antiferromagnetic (M=Au), and incommensurate (M=Ag) structures were detected. Using time-of-flight (TOF) techniques, the crystalline electric-field splittings were determined. With high-resolution TOF experiments the temperature and wave-vector dependence of the magnetic relaxation rate was studied

55 citations

Journal ArticleDOI
TL;DR: In this paper, elastic scattering measurements have been performed under a hydrostatic pressure in order to investigate the spin structure of the pressure-induced magnetic ordering in the spin gap system, which has been shown to be stable in the case of spin gap systems.
Abstract: Neutron elastic scattering measurements have been performed under a hydrostatic pressure in order to investigate the spin structure of the pressure-induced magnetic ordering in the spin gap system ...

55 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202353
202296
2021187
2020224
2019247
2018229