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 Pis'ma v Zh. Èksper. Teoret. Fiz., 2018, Volume 107, Issue 4, Pages 232–236 (Mi jetpl5500)

CONDENSED MATTER

Effect of nitrogenation and hydrogenation on the magnetic properties and structure of the Sm$_2$Fe$_{17}$ alloy: analysis of XMCD data

A. P. Menushenkova, A. G. Savchenkob, V. G. Ivanova, A. A. Ivanova, I. V. Shchetininb, V. P. Menushenkovb, I. A. Rudneva, A. V. Rafal'skiib, D. G. Zhukovb, M. Platunovc, F. Wilhelmc, A. Rogalevc

a National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, Russia
b National University of Science and Technology MISIS, Moscow, Russia
c European Synchrotron Radiation Facility (ESRF), CS40220, Grenoble Cedex 9, France

Abstract: Changes in the local magnetic and structural properties of Sm$_2$Fe$_{17}$ alloys at nitrogenation and hydrogenation of samples have been studied by the X-ray magnetic circular dichroism (XMCD) technique at the Fe $K$ absorption edge and Sm $L_3$ absorption edge using synchrotron radiation. The results have been discussed in comparison with X-ray diffraction data and macroscopic vibration magnetometry measurements. The observed changes in XMCD spectra indicate a noticeable effect of nitrogenation on the local magnetic properties of sublattices of both iron and samarium, whereas hydrogenation of samples makes a small effect. The mentioned effects have been analyzed and discussed in terms of the effect of nitrogen (N) and hydrogen (H) interstitial atoms on Sm $5d$ and Fe $4p$ electronic states. The effect of nitrogenation is larger than the effect of hydrogenation because the volume expansion of the crystal lattice of initial Sm$_2$Fe$_{17}$ in the case of nitrogenation is larger than that in the case of hydrogenation. The studied local magnetization curves for samarium and iron sublattices in magnetic fields up to $17$ T also indicate a strong increase in the magnetocrystalline anisotropy at nitrogenation.

 Funding Agency Grant Number Ministry of Education and Science of the Russian Federation # 14.587.21.0028 (ïðîåêò RFMEFI58716X0028) European Synchrotron Radiation Facility MA-3314

DOI: https://doi.org/10.7868/S0370274X18040057

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English version:
Journal of Experimental and Theoretical Physics Letters, 2018, 107:4, 228–232

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Revised: 20.12.2017

Citation: A. P. Menushenkov, A. G. Savchenko, V. G. Ivanov, A. A. Ivanov, I. V. Shchetinin, V. P. Menushenkov, I. A. Rudnev, A. V. Rafal'skii, D. G. Zhukov, M. Platunov, F. Wilhelm, A. Rogalev, “Effect of nitrogenation and hydrogenation on the magnetic properties and structure of the Sm$_2$Fe$_{17}$ alloy: analysis of XMCD data”, Pis'ma v Zh. Èksper. Teoret. Fiz., 107:4 (2018), 232–236; JETP Letters, 107:4 (2018), 228–232

Citation in format AMSBIB
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