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Title: Lowering of the L1{sub 0} ordering temperature of FePt nanoparticles by He{sup +} ion irradiation

Abstract

Arrays of FePt particles (diameter 7 nm) with mean interparticle distances of 60 nm are prepared by a micellar technique on Si substrates. The phase transition of these magnetic particles towards the chemically ordered L1{sub 0} phase is tracked for 350 kV He{sup +} ion irradiated samples and compared to a nonirradiated reference. Due to the large separation of the magnetically decoupled particles the array can be safely annealed without any agglomeration as usually observed for more densely packed colloidal FePt nanoparticles. The He{sup +} ion exposure yields a significant reduction of the ordering temperature by more than 100 K.

Authors:
; ; ; ; ; ;  [1];  [2]
  1. Institut fuer Festkoerperphysik, Universitaet Ulm, Albert-Einstein-Strasse 11, 89069 Ulm (Germany)
  2. (Germany)
Publication Date:
OSTI Identifier:
20971816
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 90; Journal Issue: 6; Other Information: DOI: 10.1063/1.2472177; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AGGLOMERATION; ANNEALING; HELIUM IONS; ION BEAMS; IRON ALLOYS; IRRADIATION; NANOSTRUCTURES; PARTICLES; PHASE TRANSFORMATIONS; PLATINUM ALLOYS; SUBSTRATES; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0065-0273 K

Citation Formats

Wiedwald, U., Klimmer, A., Kern, B., Han, L., Boyen, H.-G., Ziemann, P., Fauth, K., and Max-Planck-Institut fuer Metallforschung, Heisenbergstrasse 3, 70569 Stuttgart. Lowering of the L1{sub 0} ordering temperature of FePt nanoparticles by He{sup +} ion irradiation. United States: N. p., 2007. Web. doi:10.1063/1.2472177.
Wiedwald, U., Klimmer, A., Kern, B., Han, L., Boyen, H.-G., Ziemann, P., Fauth, K., & Max-Planck-Institut fuer Metallforschung, Heisenbergstrasse 3, 70569 Stuttgart. Lowering of the L1{sub 0} ordering temperature of FePt nanoparticles by He{sup +} ion irradiation. United States. doi:10.1063/1.2472177.
Wiedwald, U., Klimmer, A., Kern, B., Han, L., Boyen, H.-G., Ziemann, P., Fauth, K., and Max-Planck-Institut fuer Metallforschung, Heisenbergstrasse 3, 70569 Stuttgart. Mon . "Lowering of the L1{sub 0} ordering temperature of FePt nanoparticles by He{sup +} ion irradiation". United States. doi:10.1063/1.2472177.
@article{osti_20971816,
title = {Lowering of the L1{sub 0} ordering temperature of FePt nanoparticles by He{sup +} ion irradiation},
author = {Wiedwald, U. and Klimmer, A. and Kern, B. and Han, L. and Boyen, H.-G. and Ziemann, P. and Fauth, K. and Max-Planck-Institut fuer Metallforschung, Heisenbergstrasse 3, 70569 Stuttgart},
abstractNote = {Arrays of FePt particles (diameter 7 nm) with mean interparticle distances of 60 nm are prepared by a micellar technique on Si substrates. The phase transition of these magnetic particles towards the chemically ordered L1{sub 0} phase is tracked for 350 kV He{sup +} ion irradiated samples and compared to a nonirradiated reference. Due to the large separation of the magnetically decoupled particles the array can be safely annealed without any agglomeration as usually observed for more densely packed colloidal FePt nanoparticles. The He{sup +} ion exposure yields a significant reduction of the ordering temperature by more than 100 K.},
doi = {10.1063/1.2472177},
journal = {Applied Physics Letters},
number = 6,
volume = 90,
place = {United States},
year = {Mon Feb 05 00:00:00 EST 2007},
month = {Mon Feb 05 00:00:00 EST 2007}
}