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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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Journal ArticleDOI
Markus Donath1
TL;DR: In this paper, surface-sensitive spin-resolved appearance potential spectroscopy and inverse photoemission were proposed to study the magnetic properties of thin ultrathin films on the basis of the spin-dependent electronic structure.
Abstract: The magnetic order in ultrathin films depends critically on a variety of film parameters. Therefore, to understand the magnetic properties of thin films on the basis of the spin-dependent electronic structure is a challenging task for both experimentalists and theoreticians. Experimentally, spin-resolved electron spectroscopies probe directly either the spin-dependent density of states or specific energy states, often at a defined wave vector. In this paper, two surface-sensitive techniques, that provide complementary information about the unoccupied electronic states, are described. Spin-resolved appearance potential spectroscopy gives element-specific access to the spin-dependent local density of states. Spin-resolved inverse photoemission permits detailed investigations of electron states characteristic of the surface and the layers underneath as a function of the wave vector. Both techniques are sensitive also to the film structure. A variety of magnetic film properties is discussed in the light of the electronic structure. The examples described in this paper include Fe films on W(110) and Cu(001) as well as Gd films on W(110).

50 citations

Journal ArticleDOI
TL;DR: The results of MFM measurements performed under in-plane magnetic field demonstrate that it is possible to switch from the multivortex configuration to a single vortex configuration with low magnetic fields.
Abstract: Cylindrical nanowires synthesized by controlled electrodeposition constitute excellent strategic candidates to engineer magnetic domain configurations. In this work, multisegmented CoNi/Ni nanowires are synthesized for tailoring a periodic magnetic structure determined by the balance between magnetocrystalline and magnetostatic energies. High-resolution Transmission Electron Microscopy confirms the segmented growth and the sharp transition between layers. Although both CoNi and Ni segments have similar fcc cubic crystal symmetry, their magnetic configuration is quite different as experimentally revealed by Magnetic Force Microscopy (MFM) imaging. While the Ni segments are single domain with axial magnetization direction, the CoNi segments present two main configurations: a single vortex state or a complex multivortex magnetic configuration, which is further interpreted with the help of micromagnetic simulations. This original outcome is ascribed to the tight competition between anisotropies. The almost monocrystalline fcc structure of the CoNi segments, as revealed by the electron diffraction patterns, which is atypical for its composition, contributes to balance the magnetocrystalline and shape anisotropies. The results of MFM measurements performed under in-plane magnetic field demonstrate that it is possible to switch from the multivortex configuration to a single vortex configuration with low magnetic fields.

50 citations

Journal ArticleDOI
TL;DR: In this article, the perovskite orthoferrite SmFeO3 was synthesized by the hydrothermal method and the Neel temperature of this material was found to be 655 K by temperature-dependent magnetization measurements.

50 citations

Journal ArticleDOI
TL;DR: In this paper, the magnetic structure of the magnetization in ferrimagnetic Fe/Gd multilayer films has been investigated and the experimental results of the field and temperature dependence of magnetization agree fairly well with the calculated ones based on the molecular field model.
Abstract: Spin-flop and compensation phenomena of the magnetization in ferrimagnetic Fe/Gd multilayer films have extensively been investigated. It turns out that experimental results of the field and temperature dependence of magnetization agree fairly well with the calculated ones based on the molecular field model. In the calculation, we have obtained the magnetic structure, assuming that the composition is modulated stepwise, and that the exchange interactions in Fe and Gd layers are the same values as those in bulk Fe and Gd metals, respectively. Both longitudinal and transverse magnetoresistances show a crossover near the spin flop field due to the change in the magnetic structure. This crossover behavior is qualitatively well simulated by the calculation on the assumption of the parallel current flow in each atomic layer.

50 citations

Journal ArticleDOI
TL;DR: In this article, the authors explored why the magnetic oxide Li2CuO2, consisting of CuO2 ribbon chains made up of edge-sharing CuO4 squares, does not exhibit a spiral-magnetic order.
Abstract: On the basis of first principles density functional theory electronic structure calculations as well as classical spin analysis, we explored why the magnetic oxide Li2CuO2, consisting of CuO2 ribbon chains made up of edge-sharing CuO4 squares, does not exhibit a spiral-magnetic order. Our work shows that, due to the next-nearest-neighbor interchain interactions, the observed collinear magnetic structure becomes only slightly less stable than the spin-spiral ground state, and many states become nearly degenerate in energy with the observed collinear structure. This suggests that the collinear magnetic structure of Li2CuO2 is a consequence of order-by-disorder induced by next-nearest-neighbor interchain interactions.

50 citations


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