Schematic illustration of magnetization dynamics. The precessional motion of M around Heff
is depicted by the blue solid-dashed curve, and the nutation is shown by the red curve. |
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| Bridging the gap: the ASD link between ab initio methods and micromagnetics simulations. |
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| Radial distribution of the magnetic anisotropy parameters (dots) in the E plane in the case of NS=50 samples with N=225+25 atoms. The continuous line presents the predictions of the Gaussian orthogonal ensemble. Inset: Distribution of (K1,K2) in the E plane for these 50 nanograins. At this level of disorder the triangular structure is almost entirely lost. |
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| (a) The geometry of the contact viewed from the (110) direction. The leads are depicted as dark (blue) rectangles, the cobalt atoms forming the contact are represented by gray (orange) circles, and a denotes the nearest neighbor distance in the fcc structure. (b) Sketch of the embedded cluster. Dark (blue) circles: selected atoms of the cobalt leads; gray (orange) circles: cobalt atoms in the nanocontact; empty circles: empty spheres around the contact. |
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| Left: Density of states (DOS) projected over the majority spin d orbitals in the octahedral iron sites within different crystal environments. Organic acid bonded to magnetite surface. DOS projected over octahedral iron bonded to the organic acid. Because of the influence of the oxygen ions in the carboxylic group, occupancies are very similar to the bulk case, and the reduction of magnetization at the surface is partially lifted. Middle: High-resolution Z-contrast STEM images of a Fe3O4 NP showing high crystal quality. Right: Top: L2,3 profile along the direction of the blue arrow in panel d (in red and in black for I+ and I− L23 ratio maps respectively). Bottom: difference between I+ and I− L2,3 ratios along the NP. The scale bar represents 5 nm in all panels. |
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| The Fe and Mn domain images as functions of tMn, taken at 105 K, at the region where the Fe film reveals the flipping magnetization (indicated by white arrows). The Mn layer yields nonvanishing IA at integer layer thickness and approaches to zero value at half-integer layer thickness. A very small IA signal for the Mn layer could be attributed to a nearly orthogonal included angle between the photohelicity and in-plane magnetization. |
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| Magnetic moment averaged per Fe atom from SQUID measurements (black circles), together with theoretical calculations of MgO/Fe/MgO structures with symmetric Fe-O bonding (green diamonds), and asymmetric coordination (blue triangles), as a function of the Fe thickness. The experimental data are fitted to a phenomenological exponential decaying function (as mm = mmbulk + mmsurface e[1−thickness]/k, with the characteristic decay length k = 6 ML), which converge at large coverage to bulk Fe values. |
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| XMCD photoelectron emission microscopy asymmetry images of L10-ordered FePd (a) and FePt (b) taken at the Fe L3-absorption edge for the demagnetized domain state at room temperature and in zero magnetic field. The insets to the upper right corner show the result of micromagnetic simulations. |
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| Magnetic loops and temperature dependence of exchange bias field. |
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| Results of the first-principles calculations. |
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| The unit cell of CuO and the two neighboring Cu-O layers in the ac planes. The light and dark gray balls represent oxygen and copper atoms, respectively. Top right: The clusters used in this wor |
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| Phase diagram of FeO. Stabilities of rB1, insulating B1, and metallic B1 phases are represented by solid, gray solid and open symbols, respectively. Circles, squares and triangles indicate each set of experiments (runs1–3). A metal-insulator transition boundary shown as bold line is determined from present data, and linearly extrapolated to the melting condition (broken bold line). The estimated uncertainty in location of the transition is shown by gray band. |
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| Summary of results for frustrated magnets. (a) Heisenberg pyrochlore antiferromagnet; (b) ‘‘hexagonal spin cluster’’ spinel ZnCr2O4; (c) GGG; (d) hyperkagome Na4Ir3O8; (e) extended kagome YBaCo4O7; (f ) kagome XY system; (g) kagome Ising system. The left-hand column shows the RMC fit to simulated powder diffraction data (calculation details given in Ref. [12]). Input data are shown in black, RMC fit in red, and difference (RMC data) in blue. |
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| Sketches of interfacial noncollinear spin configurations after the self-consistency calculation reaches convergence. Here, the initial spins SMn’s are along the (100) direction while SRu’s are along (001). |
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| Spin-transfer torque parameter versus resistivity for several ratios (r = 0.5, 1.0, 2.0) of spin-dependent scattering rates for Ni. The top panel gives β, the middle panel β/α, and the bottom panel βσP/(ασ). The dashed vertical lines indicate the approximate room-temperature resistivity. |
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| Ground-state spin configurations of the Fe monolayer with experimental layer relaxation (a) without and (b) with biquadratic couplings. |
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| The exchange parameter as a function of interatomic distance to the n-th neighbour Jn(Rn) for different c/a ratios. |
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| N´eel temperatures as a function of U for NiO, CoO, and MnO. The dashed lines denote the experimental values and the gray solid lines are Monte Carlo simulations. |
