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首页> 外文期刊>Physical review >Spin-wave stiffness in the Dzyaloshinskii-Moriya helimagnets Mn_(1-x)Fe_xSi
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Spin-wave stiffness in the Dzyaloshinskii-Moriya helimagnets Mn_(1-x)Fe_xSi

机译：Dzyaloshinskii-Moriya helimagnets Mn_（1-x）Fe_xSi中的自旋波刚度

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The small-angle neutron scattering is used to measure the spin-wave stiffness in the field-polarized state of the Dzyaloshinskii-Moriya helimagnets Mn_(1-x)Fe_xSi with x= 0.03, 0.06, 0.09, and 0.10. The Mn_(1-x)Fe_xSi compounds are helically ordered below T_c and show a helical fluctuation regime above T_c in a wide range up to T_(DM). The critical temperatures T_c and T_(DM) decrease with x and tend to 0 at x = 0.11 and 0.17, respectively. We have found that the spin-wave stiffness A change weakly with temperature for each individual Fe-doped compound. On the other hand, the spin-wave stiffness A decreases with x duplicating the T_(DM) dependence on x, rather than T_c(x). These findings classify the thermal phase transition in all Mn_(1-x)Fe_xSi compounds as an abrupt change in the spin state caused, most probably, by the features of an electronic band structure. Moreover, the criticality in these compounds is not related to the value of the ferromagnetic interaction but demonstrates the remarkable role of the Dzyaloshinskii-Moriya interaction as a factor destabilizing the magnetic order.
机译：小角中子散射用于测量Dzyaloshinskii-Moriya helimagnets Mn_（1-x）Fe_xSi的场极化状态下的自旋波刚度，其中x = 0.03、0.06、0.09和0.10。 Mn_（1-x）Fe_xSi化合物在T_c以下呈螺旋状排列，并且在T_c以上在高达T_（DM）的宽范围内均显示出螺旋波动状态。临界温度T_c和T_（DM）随x降低，在x = 0.11和0.17时趋于0。我们已经发现，每种掺杂铁的化合物的自旋波刚度A随温度变化很小。另一方面，自旋波刚度A随着x的减小而减小，从而使T_（DM）对x的依赖性增加，而不是T_c（x）。这些发现将所有Mn_（1-x）Fe_xSi化合物的热相变归类为自旋态的突变，这很可能是由于电子能带结构的特征引起的。此外，这些化合物的临界性与铁磁相互作用的值无关，但证明了Dzyaloshinskii-Moriya相互作用作为破坏磁序的因素的显着作用。

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  • 来源
    《Physical review》 |2018年第2期|024409.1-024409.7|共7页
  • 作者

    S. V. Grigoriev; E. V. Altynbaev; S.-A. Siegfried; K. A. Pschenichnyi; D. Menzel; A. Heinemann; G. Chaboussant;

  • 作者单位

    Petersburg Nuclear Physics Institute NRC "Kurchatov institute", Gatchina, St-Petersburg, 188300, Russia,Saint-Petersburg State University, Ulyanovskaya 1, Saint-Petersburg, 198504, Russia,Institute for High Pressure Physics, Russian Academy of Sciences, 142190 Troitsk, Moscow, Russia;

    Petersburg Nuclear Physics Institute NRC "Kurchatov institute", Gatchina, St-Petersburg, 188300, Russia,Saint-Petersburg State University, Ulyanovskaya 1, Saint-Petersburg, 198504, Russia,Institute for High Pressure Physics, Russian Academy of Sciences, 142190 Troitsk, Moscow, Russia;

    Helmholtz Zentrum Geesthacht, Geesthacht, 21502, Germany;

    Petersburg Nuclear Physics Institute NRC "Kurchatov institute", Gatchina, St-Petersburg, 188300, Russia,Saint-Petersburg State University, Ulyanovskaya 1, Saint-Petersburg, 198504, Russia,Institute for High Pressure Physics, Russian Academy of Sciences, 142190 Troitsk, Moscow, Russia;

    Technische UniversMt Braunschweig, 38106 Braunschweig, Germany;

    Helmholtz Zentrum Geesthacht, Geesthacht, 21502, Germany;

    Laboratoire Leon Brillouin, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France;

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