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Chiral magnetic soliton lattice in inorganic chiral materials, probed by neutron diffraction experiments

AutorKousaka, Yusuke; Campo, Javier; Inoue, Katsuya
Palabras claveChiral magnetic soliton
Neutron diffraction
Fecha de publicación2014
CitaciónIRSChM 2014
ResumenChirality, meaning left- or right-handedness, plays an essential role in syrnmetry properties of nature at all length scales from elementary particles to cosmic science. In material sciences, it is very important to understand the chirality in crystal and magnetic structures both from theoretical and experimental viewpoints. Recently, large attention has been paid to the relationship between crystallographic chirality and that of magnetic structure, because the sense of a helical spin structure depends on the right- or left-handed chiral crystallographic structure that allows an asymmetric Dzyaloshinskii-Moriya (DM) interaction. When a magnetic field is applied perpendicular to the helical axis, the chiral helical magnetic structure continuously transforms into chiral magnetic soliton lattice. The period is controlled by the field continuously. Formation of the chiral magnetic soliton lattice is theoretically expected to exhibit attracting new phenomena like chiral giant magnetoresistance effect. However, there have been few experimental results due to the difficulty to synthesize the suitable materials to realize such research. in chiral helical magnetic structures, the pitch angle, mainly determined by the ratio of exchange interaction and DM interaction, is usually very small. As a result, the helimagnetic period can be hundreds of angstroms. Therefore sometimes the angle resolution of thermal neutron difraction experiments is not high enough to separate a fundamental nuclear peak and magnetic satellite peaks. As consequence, some compounds with chiral incommensurate magnetic structure may be easily misinterpreted as ferromagnetic ordering. Firstly, we will present a unique crystallization technique to make a single crystallographic chirality in inorganic compounds. By adapting our crystallization technique, we succeeded in obtaining the mm-ordered enantiopure single crystals. Secondly, we will present neutron diffraction works performed at BL08 (Super HRPD) and BL15 (TAIKAN) in the Materials and Life Science Experimental Facility (MLF) of J-PARC. By means of super high-resolution powder neutron diffraction in Super HRPD, we observed very long periodical magnetic satellite peaks.
DescripciónResumen del trabajo presentado al: "International Research Symposium on Chiral Magnetism" celebrado en Hiroshima (Japón) del 6 al 8 de diciembre de 2014.-- et al.
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