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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, the authors used magnetotransport measurements to map out the field-temperature phase diagram of the centrosymmetric Mn kagome lattice and show that the system exhibits the topological Hall effect (THE) with an in-plane applied magnetic field around 240 K.
Abstract: Geometric frustration in the kagome lattice makes it a great host for the flat electronic band, nontrivial topological properties, and novel magnetism. Here, we use magnetotransport measurements to map out the field-temperature phase diagram of the centrosymmetric $\mathrm{Y}{\mathrm{Mn}}_{6}{\mathrm{Sn}}_{6}$ with a Mn kagome lattice and show that the system exhibits the topological Hall effect (THE) with an in-plane applied magnetic field around 240 K. In addition, our neutron diffraction results demonstrate that the observed THE cannot arise from a magnetic skyrmion lattice, but instead from an in-plane field-induced double-fan spin structure with $c$-axis components. This paper provides a platform to understand the influence of a field-induced novel magnetic structure on magnetoelectric response in topological kagome metals.
70 citations
TL;DR: In this paper, the authors determined unusual magnetic ordering of the hexagonal intermetallic uranium compound U${\mathrm{N}}_{\mathm{i}4}$B via neutron diffraction.
Abstract: We have determined unusual magnetic ordering of the hexagonal intermetallic uranium compound U${\mathrm{N}}_{\mathrm{i}4}$B via neutron diffraction. In the easy basal plane the U moments have triangular symmetry with antiferromagnetic interactions. Along the hard $c$ axis ferromagnetic coupling occurs. Below ${T}_{N}=20$ K only two out of every three U moments of $1.2{\ensuremath{\mu}}_{B}$ order in vortexlike arrangements around the third paramagnetic spin. This novel magnetic structure is related to the occurrence of a crystallographic superstructure. Previously observed anomalies in bulk properties below ${T}_{N}$ are attributed to unconventional spin-wave excitations associated with this type of ordering.
70 citations
TL;DR: In this paper, the evolution with temperature of the magnetic structure of the C15 Laves-phase compound DyMn2 has been studied using powder neutron diffraction and magnetization techniques.
Abstract: The evolution with temperature of the magnetic structure of the C15 Laves-phase compound DyMn2 has been studied using powder neutron diffraction and magnetization techniques. The Dy sublattice assumes a spin-canted ferromagnetic structure with 8.8 mu B per Dy atom. Although all Mn sites within the unit cell are chemically equivalent, only one Mn atom in four is found to possess a magnetic moment (of 1.4 mu B). These magnetic Mn atoms are located at sites with a strongly polarizing magnetic environment resulting from a near-neighbour configuration of ferromagnetically coupled Dy spins. A spin reorientation is observed at 36 K, and is accompanied by a small thermal expansion anomaly. The Curie temperature of DyMn2 is found to be 45 K.
70 citations
TL;DR: An unprecedented magneto-orbital texture in multiferroic CaMn(7)O(12), found to give rise to the largest magnetically induced ferroelectric polarization measured to date, opens up the possibility of discovering newMultiferroics with even larger polarization and higher transition temperatures.
Abstract: Orbital physics drives a rich phenomenology in transition-metal oxides, providing the microscopic underpinning for effects such as Colossal Magnetoresistance. In particular, magnetic and lattice degrees of freedom are coupled through orbital ordering, and it has long been hoped that this coupling could be exploited to create high-temperature multiferroics with large values of the electrical polarization. Here we report an unprecedented magneto-orbital texture in multiferroic CaMn7O12, found to give rise to the largest magnetically induced ferroelectric polarization measured to date. X-ray diffraction characterization of the structural modulation in these ‘magneto-orbital helices’, and analysis of magnetic exchange shows that orbital order is crucial in stabilising a chiral magnetic structure, thus allowing for electric polarization. Additionally, the presence of a global structural rotation enables the coupling between this polarization and magnetic helicity required for multiferroicity. These novel principles open up the possibility of discovering new multiferroics with even larger polarization and higher transition temperatures. The coupling of magnetism and ferroelectricity is of relevance for applications such as sensing, but occurs only rarely in bulk materials. The large magnetically induced ferroelectric polarization observed here in CaMn7O12establishes a new approach to achieve a strong magnetoelectric coupling.
70 citations
TL;DR: An antiferromagnetic superlattice of Fe/Cr(211) is used as a model system to study magnetic transitions in a finite-size geometry and the magnetic structure at the surface spin-flop transition and its evolution with field is determined.
Abstract: An antiferromagnetic (AF) superlattice of Fe/Cr(211) is used as a model system to study magnetic transitions in a finite-size geometry. With polarization neutron reflectometry the magnetic structure at the surface spin-flop transition and its evolution with field is determined. A domain wall created near the surface penetrates the superlattice with increasing field, splitting it into two antiphase, AF domains. After reaching the center the spin-flopped phase spreads throughout the superlattice. The experimental results are in substantial agreement with theoretical and numerical predictions.
70 citations