Anisotropic lattice dynamics of FePt L10 thin films

被引：13

作者：

Couet, S. ^{[1
,2
]}

Sternik, M. ^{[3
]}

Laenens, B. ^{[1
,2
]}

Siegel, A. ^{[3
]}

Parlinski, K. ^{[3
]}

Planckaert, N. ^{[1
,2
]}

Groestlinger, F. ^{[4
]}

Chumakov, A. I. ^{[5
]}

Rueffer, R. ^{[5
]}

Sepiol, B. ^{[4
]}

Temst, K. ^{[1
,2
]}

Vantomme, A. ^{[1
,2
]}

机构：

[1] Katholieke Univ Leuven, Inst Kern & Stralingsfys, B-3001 Louvain, Belgium

[2] Katholieke Univ Leuven, INPAC, B-3001 Louvain, Belgium

[3] Polish Acad Sci, Inst Nucl Phys, Krakow, Poland

[4] Univ Vienna, Fak Phys, A-1090 Vienna, Austria

[5] European Synchrotron Radiat Facil, F-38043 Grenoble, France

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 09期

基金：

奥地利科学基金会;

关键词：

AXIS;

D O I：

10.1103/PhysRevB.82.094109

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We employed nuclear inelastic scattering of synchrotron radiation to measure the anisotropy in the phonon density of states of an FePt thin film ordered in the L1(0) phase and compared our results with ab initio calculations. We find a strong anisotropy in the phonon density of states along the a and c axes of the crystal, which induces a difference in the calculated thermodynamic and elastic parameters along these axes. Calculations of surface-related effects show that a strong deviation from the bulk vibrational spectrum is observed for an Fe-terminated surface. We deduce by comparison with our surface sensitive measurement that the FePt(100)-oriented surface is Pt terminated. This contrasts with a recent measurement on FePt nanoparticles, where additional low-energy modes are observed. The findings are expected to be representative of the lattice dynamics of L1(0) intermetallics.

引用

页数：4

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