Correlation Between Atomic Ordering and Magnetic Properties in FePtCu Thin Films
This study explores the relationship between atomic ordering and magnetic properties in FePtCu thin films. The research delves into the magnetic behavior, hysteresis loop analysis, and Exafs results of FePtCu alloys. By examining the Pt LIII Edge data and Cu content variations, the study reveals insights into the magnetic behavior and chemical order in these materials. Conclusions are drawn regarding magnetic anisotropy, tetragonal distortion, and X-chemical order in FePtCu thin films.
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Presentation Transcript
CORRELATION BETWEEN ATOMIC ORDERING AND MAGNETIC PROPERTIES IN FePtCu THIN FILMS S. Lauretia, C. Brombacherb, D. Makarovb, M. Albrechtb, D. Peddisa, G. Varvaroa, and F. D Acapitoc aISM-CNR, Area della Ricerca RM1, Via Salaria Km 29,300, P.B. 10-00015, Monterotondo Scalo, Roma, Italy bInstitute of Physics, Chemnitz University of Technology, Chemnitz, Germany c CNR-IOM-OGG c/o ESRF, LISA (ex GILDA) Grenoble, France sara.laureti@ism.cnr.it SIF 2015- Roma, 21 - 25 September 2015
The message EXAFS EXAFS to to understand understand the the MAGNETIC PROPERTIES MAGNETIC PROPERTIES The system The system 3d- -5d 5d based alloys: based alloys: FePt c 3d FePt, , CoPt CoPt, , CoPd CoPd Easy axis a b Ordered fct (L10) Disordered fcc (A10) high magnetocrystalline anisotropy magnetically hard out of plane low anisotropy magnetically soft in-plane Artificial Artificial layering layering Strain/pressure Strain/pressure M M addition addition of of a a third third element element (Ag, (Ag, Cu Cu ) ) 800px-HDDspin H H FePtCu 2 SIF 2015- Roma, 21 - 25 September 2015 Sara.laureti@ism.cnr.it
Magnetic Magnetic behaviour behaviour 300 K hysteresis loop (SQUID) 8 7 6 5 Keff (106 ergcm-3) 4 3 2 1 0 -1 0 5 10 15 20 25 Cu (at %) 3 SIF 2015- Roma, 21 - 25 September 2015 Sara.laureti@ism.cnr.it
Exafs Exafs results results Pt LIII EDGE: DATA Parallel to the film WHY? high sensitivity element selectivity HOW? fluorescence mode, Exp: polarized beam Fit: linear combination between DIRECT (Pt on Pt sites) and INVERSE (Pt on Fe sites) structure Perpendicular to the film WHAT? -Pt-LIII edge -Cu-K edge -Pt-Pt and Pt-Fe distances, the shift of the energy origin Debye-Waller Factor X-chemical order S. Laureti, et al., J. Appl. Cryst. 47 (2014) 1722 4 SIF 2015- Roma, 21 - 25 September 2015 Sara.laureti@ism.cnr.it
Exafs Exafs results results Monotonic Monotonic reduction of c/a reduction of c/a Cu content Cu content Non Non- -monotonic monotonic behavior of X behavior of X Cu at Fe sites Cu at Fe sites 5 SIF 2015- Roma, 21 - 25 September 2015 Sara.laureti@ism.cnr.it
CONCLUSIONS S. Laureti, et al., J. Appl. Cryst. 47 (2014) 1722 10 9 8 7 Keff[106 erg/cm3] 6 Magnetic Anisotropy 5 4 From SQUID measurements 3 2 1 0 0 5 10 15 20 25 Cu content - at. % Chemical order tetragonal distortion EXAFS 0.9 0.95 0.94 0.8 X-chemical order c/a 0.93 0.7 0.92 0.6 0.91 0.5 0 5 10 15 20 25 0 5 10 15 20 25 Cu content - at. % Cu content - at. % 6 SIF 2015- Roma, 21 - 25 September 2015 Sara.laureti@ism.cnr.it
7 SIF 2015- Roma, 21 - 25 September 2015 Sara.laureti@ism.cnr.it
