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Chukalkin, Yu.G.,Teplykh, A.E.,Kudrevatykh, N.V.,Choo, K.N.,Lee, S.,Andreev, A.V.,Pirogov, A.N. Elsevier 2014 JOURNAL OF ALLOYS AND COMPOUNDS Vol.615 No.-
<P><B>Abstract</B></P> <P>Magnetization and neutron diffraction measurements have been carried out to study evolution of structure and magnetic states of amorphous Nd<SUB>2</SUB>Fe<SUB>14</SUB>B and Er<SUB>2</SUB>Fe<SUB>14</SUB>B alloys under isothermal annealing at 295–1025K. The amorphization have been performed by neutron irradiation which provides a homogeneous state in different with other methods of amorphization. The annealing induces a rise of α-Fe phase content in alloys and a recrystallization into Nd<SUB>2</SUB>Fe<SUB>14</SUB>B-type phase. Neutron diffraction data show that the recrystallization occurs over narrow temperature interval (590–638) K in Er<SUB>2</SUB>Fe<SUB>14</SUB>B and at around 800K in Nd<SUB>2</SUB>Fe<SUB>14</SUB>B. Magnetic measurements testify that in both samples the magnetization and coercive field increase with annealing temperature above 800K.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Annealing of R<SUB>2</SUB>Fe<SUB>14</SUB>B amorphized by fast neutrons. </LI> <LI> Annealing leads to crystallization above 600 K (R = Er) and 800 K (R = Nd). </LI> <LI> Crystallization is accompanied by increase of magnetization and coertivity. </LI> </UL> </P>
Magnetism of ordered and disordered alloys of R<sub>2</sub>Fe<sub>14</sub>B (R=Nd, Er) type
Teplykh, A.E.,Chukalkin, Yu.G.,Lee, S.,Bogdanov, S.G.,Kudrevatykh, N.V.,Rosenfeld, E.V.,Skryabin, Yu.N.,Choi, Y.,Andreev, A.V.,Pirogov, A.N. Elsevier Sequoia 2013 Journal of alloys and compounds Vol.581 No.-
Magnetic susceptibility, magnetization and neutron diffraction measurements have been performed to study structure and magnetic states of crystalline and amorphous Nd<SUB>2</SUB>Fe<SUB>14</SUB>B and Er<SUB>2</SUB>Fe<SUB>14</SUB>B alloys. In the crystalline state there exists a large (about 20%) anisotropy of Er-sublattice magnetization. Values of the magnetic anisotropy constant of Er ions and the Er-Fe exchange-coupling parameter were estimated using temperature dependence of the Er- and Fe-sublattice magnetizations. Amorphous state of the samples was obtained by irradiation of fast (E<SUB>eff</SUB>≥1@?eV) neutrons with a fluence up to the 1.2x10<SUP>20</SUP>n/@?m<SUP>-2</SUP> at 340K. It is shown that antiferromagnetic coupling between the rare-earth and iron spins is kept in the amorphous state. Amorphization of the samples is found to result in reduction of the Curie temperature (T<SUB>C</SUB>) by about 200K and almost total absence of coercivity. We suggest that the strong decrease of T<SUB>C</SUB> is a consequence of enhancement of negative Fe-Fe interactions as a result of dispersion of interatomic distances, which is a characteristic feature of the amorphous state.
Determination of Texture Degree of NdFeB-Magnets by Means of Neutron Diffraction
Teplykh, A.E.,Bogdanov, S.G.,Choi, Yong,Kudrevatykh, Nikolai V.,Pirogov, A.N.,Popov, A.G.,Skryabin, Yu.N.,Vyatkin, V.P. Trans Tech Publications, Ltd. 2010 Diffusion and defect data. SSP. [Pt. B], Solid sta Vol.168 No.-
<P>Six samples of Nd-Fe-B-permanent magnets, distinguished in the texture degree, have been measured by neutron diffraction in the reflection and transmission regimes. The texture in the samples was formed by application of impulses of external magnetic field 0H = 4 T. Analysis of the obtained neutron diagrams by means of the Fullprof program allowed quantitative determination of the texture degree and conclusion to be made that the texture degree grows with an increase in numbers of magnetic field impulses.</P>
Effects of magnetic anisotropy and exchange in Tm2Fe17
Pirogov, A. N.,Bogdanov, S. G.,Rosenfeld, E. V.,Park, J. -G.,Choi, Y. N.,Lee, Seongsu,Prokeš,, K.,Golosova, N. O.,Sashin, I. L.,Kudrevatykh, N. V.,Skryabin, Yu. N.,Vokhmyanin, A. P. Pleiades Publishing 2012 Journal of experimental and theoretical physics Vol.115 No.5