Isotope-periodic multilayer method for short self-diffusion paths - a comparative neutron and synchrotron Mossbauer reflectometric study of FePd alloys

被引：6

作者：

Merkel, D. G. ^{[1
]}

Sajti, Sz ^{[1
]}

Fetzer, Cs ^{[1
]}

Major, J. ^{[3
]}

Major, M. ^{[3
]}

Rueffer, R. ^{[2
]}

Ruehm, A. ^{[3
]}

Stankov, S. ^{[2
]}

Tancziko, F. ^{[1
]}

Bottyan, L. ^{[1
]}

机构：

[1] KFKI Res Inst Particle & Nucl Phys, POB 49, H-1525 Budapest, Hungary

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

[3] Max Planck Inst Met Res, D-70569 Stuttgart, Germany

来源：

POLARIZED NEUTRONS AND SYNCHROTRON X-RAYS FOR MAGNETISM CONFERENCE 2009 | 2010年 / 211卷

关键词：

THIN-FILMS;

D O I：

10.1088/1742-6596/211/1/012029

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

FePt, FePd, CoPt, and CoPd in equilibrium exhibit the L1(0) structure with high perpendicular magnetic anisotropy making them attractive candidates for high-density magnetic recording. Magnetic properties of these films depend on the distribution and orientation of the L1(0) fraction controlled by diffusion on atomic scale. Epitaxial isotope-periodic (FePd)-Fe-nat/(FePd)-Fe-57 alloy films were prepared by molecular beam epitaxy and heat treated at 500 degrees C for various retention times. Isotope-sensitive non-destructive methods, neutron reflectometry and synchrotron Mossbauer reflectometry were applied to follow very short diffusion paths normal to the film plane. Squared diffusion lengths and diffusion profiles were obtained from the fitting of experimental reflectivity curves for each annealing treatment steps. The somewhat different diffusion lengths obtained for the neutron and synchrotron Mossbauer reflectograms of the same samples are explained by the larger footprint of the sample in the neutron experiment for which interface inhomogeneities are to be averaged. Diffusion in the microscopically different local environments were modelled by piecewise constant diffusion coefficients in the regions identified as different species by conversion electron Mossbauer spectroscopy.

引用

页数：6