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Title: Modification of the structural and magnetic properties of granular FePt films by seed layer conditioning

Abstract

The steadily increasing amount of digital information necessitates the availability of reliable high capacity magnetic data storage. Here, future hard disk drives with extended areal storage densities beyond 1.0 Tb/in{sup 2} are envisioned by using high anisotropy granular and chemically L1{sub 0}-ordered FePt (002) perpendicular media within a heat-assisted magnetic recording scheme. Perpendicular texturing of the [001] easy axes of the individual grains can be achieved by using MgO seed layers. It is therefore investigated, if and how an Ar{sup +} ion irradiation of the MgO seed layer prior to the deposition of the magnetic material influences the MgO surface properties and hereby the FePt [001] texture. Structural investigations reveal a flattening of the seed layer surface accompanied by a change in the morphology of the FePt grains. Moreover, the fraction of small second layer particles and the degree of coalescence of the primarily deposited FePt grains strongly increases. As for the magnetic performance, this results in a reduced coercivity along the magnetic easy axis (out of plane) and in enhanced hard axis (in-plane) remanence values. The irradiation induced changes in the magnetic properties of the granular FePt-C films are traced back to the accordingly modified atomic structure of themore » FePt-MgO interface region.« less

Authors:
 [1];  [2]; ; ;  [1]; ; ; ; ; ;  [3]
  1. IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, D-01171 Dresden (Germany)
  2. (Germany)
  3. HGST-A Western Digital Company, 3403 Yerba Buena Rd, San Jose, California 95135 (United States)
Publication Date:
OSTI Identifier:
22399202
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANISOTROPY; ARGON IONS; COALESCENCE; COERCIVE FORCE; GRANULAR MATERIALS; INTERFACES; INTERMETALLIC COMPOUNDS; IRON; IRRADIATION; LAYERS; MAGNESIUM OXIDES; MAGNETIC DISKS; MAGNETIC MATERIALS; MAGNETIC PROPERTIES; MORPHOLOGY; PHYSICAL RADIATION EFFECTS; PLATINUM; SURFACE PROPERTIES; TEXTURE; THIN FILMS

Citation Formats

Wicht, S., E-mail: s.wicht@ifw-dresden.de, TU Dresden, Institut für Werkstoffwissenschaft, Helmholtzstraße 10, D-01069 Dresden, Neu, V., Schultz, L., Rellinghaus, B., E-mail: b.rellinghaus@ifw-dresden.de, Mehta, V., Jain, S., Reiner, J., Mosendz, O., Hellwig, O., and Weller, D.. Modification of the structural and magnetic properties of granular FePt films by seed layer conditioning. United States: N. p., 2015. Web. doi:10.1063/1.4905422.
Wicht, S., E-mail: s.wicht@ifw-dresden.de, TU Dresden, Institut für Werkstoffwissenschaft, Helmholtzstraße 10, D-01069 Dresden, Neu, V., Schultz, L., Rellinghaus, B., E-mail: b.rellinghaus@ifw-dresden.de, Mehta, V., Jain, S., Reiner, J., Mosendz, O., Hellwig, O., & Weller, D.. Modification of the structural and magnetic properties of granular FePt films by seed layer conditioning. United States. doi:10.1063/1.4905422.
Wicht, S., E-mail: s.wicht@ifw-dresden.de, TU Dresden, Institut für Werkstoffwissenschaft, Helmholtzstraße 10, D-01069 Dresden, Neu, V., Schultz, L., Rellinghaus, B., E-mail: b.rellinghaus@ifw-dresden.de, Mehta, V., Jain, S., Reiner, J., Mosendz, O., Hellwig, O., and Weller, D.. Wed . "Modification of the structural and magnetic properties of granular FePt films by seed layer conditioning". United States. doi:10.1063/1.4905422.
@article{osti_22399202,
title = {Modification of the structural and magnetic properties of granular FePt films by seed layer conditioning},
author = {Wicht, S., E-mail: s.wicht@ifw-dresden.de and TU Dresden, Institut für Werkstoffwissenschaft, Helmholtzstraße 10, D-01069 Dresden and Neu, V. and Schultz, L. and Rellinghaus, B., E-mail: b.rellinghaus@ifw-dresden.de and Mehta, V. and Jain, S. and Reiner, J. and Mosendz, O. and Hellwig, O. and Weller, D.},
abstractNote = {The steadily increasing amount of digital information necessitates the availability of reliable high capacity magnetic data storage. Here, future hard disk drives with extended areal storage densities beyond 1.0 Tb/in{sup 2} are envisioned by using high anisotropy granular and chemically L1{sub 0}-ordered FePt (002) perpendicular media within a heat-assisted magnetic recording scheme. Perpendicular texturing of the [001] easy axes of the individual grains can be achieved by using MgO seed layers. It is therefore investigated, if and how an Ar{sup +} ion irradiation of the MgO seed layer prior to the deposition of the magnetic material influences the MgO surface properties and hereby the FePt [001] texture. Structural investigations reveal a flattening of the seed layer surface accompanied by a change in the morphology of the FePt grains. Moreover, the fraction of small second layer particles and the degree of coalescence of the primarily deposited FePt grains strongly increases. As for the magnetic performance, this results in a reduced coercivity along the magnetic easy axis (out of plane) and in enhanced hard axis (in-plane) remanence values. The irradiation induced changes in the magnetic properties of the granular FePt-C films are traced back to the accordingly modified atomic structure of the FePt-MgO interface region.},
doi = {10.1063/1.4905422},
journal = {Journal of Applied Physics},
number = 1,
volume = 117,
place = {United States},
year = {Wed Jan 07 00:00:00 EST 2015},
month = {Wed Jan 07 00:00:00 EST 2015}
}