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Title: Structural and magnetic properties of Nd{sub 2}Fe{sub 17-{delta}}Ga{sub {delta}} ({delta}{<=}2)

Abstract

Magnetization measurements of Nd{sub 2}Fe{sub 17-{delta}}Ga{sub {delta}} ({delta}=0-2) show that the saturation magnetization, M{sub s}, decreases with an increase in Ga content from 40.4 {mu}{sub B}/f.u. for Nd{sub 2}Fe{sub 17} to 36.1 {mu}{sub B}/f.u. for Nd{sub 2}Fe{sub 15}Ga{sub 2} at 4.2 K. Neutron diffraction data at 25 K show that the magnetic moment of Fe depends on its crystallographic site and decreases in the order Fe(6c)>Fe(18f){>=}Fe(18h){>=}Fe(9d). The magnetic moments of Fe(9d), Fe(18f), and Fe(18h) are found to be practically independent of the Ga content. However, the magnetic moment of Fe(6c) decreases from 2.81(9) {mu}{sub B} in Nd{sub 2}Fe{sub 17} to 2.14(9) {mu}{sub B} in Nd{sub 2}Fe{sub 15}Ga{sub 2}. The decrease of the Fe(6c) moment clearly reduces the exchange interaction between Fe(6c)-Fe(6c) dumbbell pairs which explains the decrease in the anomalous thermal expansion with an increase in Ga concentration. The reduced Fe(6c)-Fe(6c) exchange interaction may also play an important role in increasing the Curie temperature, T{sub C}, with Ga content; T{sub C} increases from 327 K in Nd{sub 2}Fe{sub 17} to 535 K in Nd{sub 2}Fe{sub 15}Ga{sub 2}. (c) 2000 American Institute of Physics.

Authors:
 [1];  [2];  [3];  [4];  [1];  [5];  [6]
  1. Material Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  2. (United States)
  3. Laboratoire des Champs Magnetiques Intenses, CNRS/MPI, 38042 Grenoble, (France)
  4. Neutron Program for Materials Research, Steacie Institute for Molecular Sciences, NRC, Chalk River, Ontario K0J 1P0, (Canada)
  5. Department of Physics, Centre for the Physics of Materials, McGill University, 3600 University Street, Montreal, Quebec, H3A 2T8, (Canada)
  6. Department of Material Science and Mineral Engineering, University of California, Berkeley, California 94720 and Material Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
Publication Date:
OSTI Identifier:
20216232
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 87; Journal Issue: 9; Other Information: PBD: 1 May 2000; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NEODYMIUM ALLOYS; IRON ALLOYS; GALLIUM ALLOYS; MAGNETIZATION; NEUTRON DIFFRACTION; MAGNETIC MOMENTS; CHEMICAL COMPOSITION; EXCHANGE INTERACTIONS; CRYSTAL STRUCTURE; EXPERIMENTAL DATA

Citation Formats

Girt, E., Department of Material Science and Mineral Engineering, University of California, Berkeley, California 94720, Guillot, M., Swainson, I. P., Krishnan, Kannan M., Altounian, Z., and Thomas, G. Structural and magnetic properties of Nd{sub 2}Fe{sub 17-{delta}}Ga{sub {delta}} ({delta}{<=}2). United States: N. p., 2000. Web. doi:10.1063/1.373335.
Girt, E., Department of Material Science and Mineral Engineering, University of California, Berkeley, California 94720, Guillot, M., Swainson, I. P., Krishnan, Kannan M., Altounian, Z., & Thomas, G. Structural and magnetic properties of Nd{sub 2}Fe{sub 17-{delta}}Ga{sub {delta}} ({delta}{<=}2). United States. doi:10.1063/1.373335.
Girt, E., Department of Material Science and Mineral Engineering, University of California, Berkeley, California 94720, Guillot, M., Swainson, I. P., Krishnan, Kannan M., Altounian, Z., and Thomas, G. Mon . "Structural and magnetic properties of Nd{sub 2}Fe{sub 17-{delta}}Ga{sub {delta}} ({delta}{<=}2)". United States. doi:10.1063/1.373335.
@article{osti_20216232,
title = {Structural and magnetic properties of Nd{sub 2}Fe{sub 17-{delta}}Ga{sub {delta}} ({delta}{<=}2)},
author = {Girt, E. and Department of Material Science and Mineral Engineering, University of California, Berkeley, California 94720 and Guillot, M. and Swainson, I. P. and Krishnan, Kannan M. and Altounian, Z. and Thomas, G.},
abstractNote = {Magnetization measurements of Nd{sub 2}Fe{sub 17-{delta}}Ga{sub {delta}} ({delta}=0-2) show that the saturation magnetization, M{sub s}, decreases with an increase in Ga content from 40.4 {mu}{sub B}/f.u. for Nd{sub 2}Fe{sub 17} to 36.1 {mu}{sub B}/f.u. for Nd{sub 2}Fe{sub 15}Ga{sub 2} at 4.2 K. Neutron diffraction data at 25 K show that the magnetic moment of Fe depends on its crystallographic site and decreases in the order Fe(6c)>Fe(18f){>=}Fe(18h){>=}Fe(9d). The magnetic moments of Fe(9d), Fe(18f), and Fe(18h) are found to be practically independent of the Ga content. However, the magnetic moment of Fe(6c) decreases from 2.81(9) {mu}{sub B} in Nd{sub 2}Fe{sub 17} to 2.14(9) {mu}{sub B} in Nd{sub 2}Fe{sub 15}Ga{sub 2}. The decrease of the Fe(6c) moment clearly reduces the exchange interaction between Fe(6c)-Fe(6c) dumbbell pairs which explains the decrease in the anomalous thermal expansion with an increase in Ga concentration. The reduced Fe(6c)-Fe(6c) exchange interaction may also play an important role in increasing the Curie temperature, T{sub C}, with Ga content; T{sub C} increases from 327 K in Nd{sub 2}Fe{sub 17} to 535 K in Nd{sub 2}Fe{sub 15}Ga{sub 2}. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.373335},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 87,
place = {United States},
year = {2000},
month = {5}
}