Tuning the Curie temperature of L1{sub 0} ordered FePt thin films through site-specific substitution of Rh

Journal Article · Tue Oct 14 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4897450· OSTI ID:22305793

Xu, Dongbin ^[1]; Sun, Cheng-Jun; Heald, Steve M. ^[1]; Chen, Jing-Sheng; Zhou, Tie-Jun ^[2]; Bergman, Anders; Sanyal, Biplab ^[3]

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1. Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
2. Data Storage Institute, Agency for Science, Technology and Research (A-STAR), Singapore 117608 (Singapore)
3. Department of Physics and Astronomy, Uppsala University, Box 516, 751 20 Uppsala (Sweden)

In structurally ordered magnetic thin films, the Curie temperature (T{sub C}) of ferromagnetic films depends on the exchange integral of the short range ordered neighboring atoms. The exchange integral may be adjusted by controlling the elemental substitutional concentration at the lattice site of interest. We show how to control the T{sub C} in high anisotropy L1{sub 0} Fe{sub 50}Pt{sub 50} magnetic thin films by substituting Rh into the Pt site. Rh substitution in L1{sub 0} FePt modified the local atomic environment and the corresponding electronic properties, while retaining the ordered L1{sub 0} phase. The analysis of extended x-ray Absorption Fine Structure spectra shows that Rh uniformly substitutes for Pt in L1{sub 0} FePt. A model of antiferromagnetic defects caused by controlled Rh substitution of the Pt site, reducing the T{sub C,} is proposed to interpret this phenomenon and its validity is further examined by ab initio density functional calculations.

• OSTI ID: 22305793
• Journal Information: Journal of Applied Physics, Vol. 116, Issue 14; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
ANISOTROPY
ANTIFERROMAGNETISM
ATOMS
COMPUTERIZED SIMULATION
CONCENTRATION RATIO
CRYSTAL DEFECTS
CURIE POINT
DENSITY FUNCTIONAL METHOD
FINE STRUCTURE
IRON ALLOYS
PLATINUM ALLOYS
RHODIUM ADDITIONS
SPECTRA
THIN FILMS
X RADIATION