Magnetic structure of Fe 1-x Co x Si in a magnetic field studied via small-angle polarized neutron diffraction
Magnetic structure of Fe 1-x Co x Si in a magnetic field studied via small-angle polarized neutron diffraction
复制标题
通过小角偏振中子衍射研究磁场中 Fe 1-x Co x Si 的磁结构
DOI：
10.1103/physrevb.76.224424
复制
发表时间：
2007
影响因子：
3.7
通讯作者：
S. V. Maleyev
中科院分区：
文献类型：
--
作者：
S. Grigoriev;V. Dyadkin;D. Menzel;J. Schoenes;Y. Chetverikov;A. Okorokov;H. Eckerlebe;S. V. Maleyev
The magnetic structure of Fe{sub 1-x}Co{sub x}Si single crystals with x=0.10,0.15,0.20,0.50 has been studied by small angle polarized neutron diffraction and superconducting quantum interference device measurements. Experiments have shown that in zero field the compounds with x=0.1,0.15 have a well-defined tendency to order in the one-handed spiral along axes due to the anisotropic exchange, that, however, decreases with increasing Co concentration x. The magnetic structure of Fe{sub 1-x}Co{sub x}Si with x=0.2,0.5 consists of spiral domains with randomly oriented spiral wave vector k. The applied magnetic field produces a single domain helix oriented along the field. The process of the reorientation starts at the field H{sub C1}. Further increase of the field leads to a magnetic phase transition from a conical to a ferromagnetic state near H{sub C2}. In the critical range near T{sub C} the integral intensity of the Bragg reflection shows a well-pronounced minimum at H{sub fl} attributed to a k flop of the helix wave vector. On the basis of our experiments we built the H-T phase diagram for each compound. It is shown that the same set of the parameters governs the magnetic properties of these compounds k, H{sub C1}, H{sub fl}, and H{sub C2}. Ourmore » experimental findings are well interpreted in the framework of a recently developed theory [Phys. Rev. B 73, 174402 (2006)] for cubic magnets with Dzyaloshinskii-Moriya (DM) interaction. In particular, the theory suggests an additional quantum term in the magnetic susceptibility caused by the DM interaction which is in good agreement with the experiment.« less
The magnetic structure of Fe{sub 1-x}Co{sub x}Si single crystals with x=0.10,0.15,0.20,0.50 has been studied by small angle polarized neutron diffraction and superconducting quantum interference device measurements. Experiments have shown that in zero field the compounds with x=0.1,0.15 have a well-defined tendency to order in the one-handed spiral along axes due to the anisotropic exchange, that, however, decreases with increasing Co concentration x. The magnetic structure of Fe{sub 1-x}Co{sub x}Si with x=0.2,0.5 consists of spiral domains with randomly oriented spiral wave vector k. The applied magnetic field produces a single domain helix oriented along the field. The process of the reorientation starts at the field H{sub C1}. Further increase of the field leads to a magnetic phase transition from a conical to a ferromagnetic state near H{sub C2}. In the critical range near T{sub C} the integral intensity of the Bragg reflection shows a well-pronounced minimum at H{sub fl} attributed to a k flop of the helix wave vector. On the basis of our experiments we built the H-T phase diagram for each compound. It is shown that the same set of the parameters governs the magnetic properties of these compounds k, H{sub C1}, H{sub fl}, and H{sub C2}. Ourmore » experimental findings are well interpreted in the framework of a recently developed theory [Phys. Rev. B 73, 174402 (2006)] for cubic magnets with Dzyaloshinskii-Moriya (DM) interaction. In particular, the theory suggests an additional quantum term in the magnetic susceptibility caused by the DM interaction which is in good agreement with the experiment.« less
影响因子：
64.8
作者：
Bode, M.;Heide, M.;Wiesendanger, R.
通讯作者：
Wiesendanger, R.