Correction of Order Parameter Calculations for FePt Perpendicular Thin Films

被引：77

作者：

Yang, En ^{[1
]}

Laughlin, David E. ^{[1
]}

Zhu, Jian-Gang ^{[1
]}

机构：

[1] Carnegie Mellon Univ, Ctr Data Storage Syst, Pittsburgh, PA 15213 USA

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2012年 / 48卷 / 01期

基金：

美国安德鲁·梅隆基金会;

关键词：

FePt; fiber texture; Lorentz factor; order parameter; MAGNETIC-PROPERTIES; HIGH COERCIVITY; TEXTURE; PHASE;

D O I：

10.1109/TMAG.2011.2164547

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The order parameter of FePt thin films plays an essential role in determining such diverse materials properties as magneto-crystalline anisotropy, magnetic coercivity and magnetic recording density. Typically, the order parameter for a bulk material is obtained by measuring the X-ray integrated intensity ratio of a super lattice peak to a fundamental peak and comparing this ratio to a theoretical value which has been calculated for a fully ordered sample. In this work, we present an analysis of the order parameter calculation in FePt L1(0) thin films taking into account the geometric features of the X-ray diffractometer, the crystallographic texture of FePt films, and the finite thickness of the films. The theoretical ratio of the (001) super lattice peak of FePt and the (002) fundamental peak of FePt is calculated as a function of the full width half maximum (FWHM) diffraction peaks from film and thickness for FePt thin films with perpendicular texture. A reliable order parameter calculation equation for Fe50Pt50 fiber textured perpendicular recording media is established.

引用

页码：7 / 12

页数：6

共 31 条

[1]

Berry D.C., 2008, THESIS CARNEGIE MELL

[2] Development of L10 FePt:C (001) Thin Films With High Coercivity and Small Grain Size for Ultra-High-Density Magnetic Recording Media [J].

Chen, J. S. ;

Hu, J. F. ;

Lim, B. C. ;

Ding, Y. F. ;

Chow, G. M. ;

Ju, G. .

IEEE TRANSACTIONS ON MAGNETICS, 2009, 45 (02) :839-844

[3]

Cullity B. D., 1978, ELEMENTS XRAY DIFFRA

[4]

Ding Y. F., 2008, APPL PHYS LETT, V93

[5] Control of the axis of chemical ordering and magnetic anisotropy in epitaxial FePt films [J].

Farrow, RFC ;

Weller, D ;

Marks, RF ;

Toney, MF ;

Cebollada, A ;

Harp, GR .

JOURNAL OF APPLIED PHYSICS, 1996, 79 (08) :5967-5969

[6] High coercivity FePt-C bulk magnet processed by spark plasma sintering and hot deformation [J].

Gopalan, R. ;

Ohkubo, T. ;

Hono, K. .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2010, 322 (21) :3423-3427

[7]

Hillert M., 1999, LECT THEORY PHASE TR

[8] Effect of initial stress/strain state on order-disorder transformation of FePt thin films [J].

Hsiao, S. N. ;

Yuan, F. T. ;

Chang, H. W. ;

Huang, H. W. ;

Chen, S. K. ;

Lee, H. Y. .

APPLIED PHYSICS LETTERS, 2009, 94 (23)

[9] X-ray scattering and absorption spectroscopy study of the order-disorder transition of (FePt)1-xCux nanoparticles [J].

Huang, TW ;

Tu, TH ;

Huang, YH ;

Lee, CH ;

Lin, CM .

IEEE TRANSACTIONS ON MAGNETICS, 2005, 41 (02) :941-943

[10] Mechanism of c-axis orientation of L10 FePt in nanostructured FePt/B2O3 thin films [J].

Ichitsubo, T. ;

Tojo, S. ;

Uchihara, T. ;

Matsubara, E. ;

Fujita, A. ;

Takahashi, K. ;

Watanabe, K. .

PHYSICAL REVIEW B, 2008, 77 (09)

← 1 2 3 4 →