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Title: Analytical TEM Examinations of CoPt-TiO2 Perpendicular Magnetic Recording Media

Abstract

For this analytical TEM study, nonmagnetic oxygen-rich boundaries were introduced into Co-Ptalloy perpendicular recording media by cosputtering Co and Pt with TiO2. Increasing the TiO2 content resulted in changes to the microstructure and elemental distribution within grains and boundaries in these films. EFTEM imaging was used to generate composition maps spanning many tens of grains, thereby giving an overall depiction of the changes in elemental distribution occurring with increasing TiO2 content. Comparing EFTEM with spectrum-imaging maps created by high-resolution STEM with EDXS and EELS enabled both corroboration of EFTEM results and quantification of the chemical composition within individual grain boundary areas. The difficulty of interpreting data from EDXS for these extremely thin films is discussed. Increasing the TiO2 content of the media was found to create more uniformly wide Ti- and O-rich grain boundaries as well as Ti- and O-rich regions within grains.

Authors:
 [1];  [2];  [3];  [2];  [2];  [1]
  1. Stanford University
  2. Seagate Media Research Center, Fremont
  3. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Shared Research Equipment Collaborative Research Center
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
931895
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Microscopy and Microanalysis; Journal Volume: 13; Journal Issue: 2
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COBALT ALLOYS; PLATINUM ALLOYS; SUBSTRATES; TITANIUM OXIDES; MAGNETIC STORAGE DEVICES; CHEMICAL COMPOSITION; MICROSTRUCTURE; THIN FILMS; TRANSMISSION ELECTRON MICROSCOPY; GRAIN BOUNDARIES; TEM; EFTEM; Co; Pt; TiO2; perpendicular magnetic recording media; EDXS; EELS

Citation Formats

Risner, Juliet D., Nolan, T. P., Bentley, James, Girt, E, HarknessIV, S. D., and Sinclair, Prof. Robert. Analytical TEM Examinations of CoPt-TiO2 Perpendicular Magnetic Recording Media. United States: N. p., 2007. Web. doi:10.1017/S1431927607070213.
Risner, Juliet D., Nolan, T. P., Bentley, James, Girt, E, HarknessIV, S. D., & Sinclair, Prof. Robert. Analytical TEM Examinations of CoPt-TiO2 Perpendicular Magnetic Recording Media. United States. doi:10.1017/S1431927607070213.
Risner, Juliet D., Nolan, T. P., Bentley, James, Girt, E, HarknessIV, S. D., and Sinclair, Prof. Robert. Mon . "Analytical TEM Examinations of CoPt-TiO2 Perpendicular Magnetic Recording Media". United States. doi:10.1017/S1431927607070213.
@article{osti_931895,
title = {Analytical TEM Examinations of CoPt-TiO2 Perpendicular Magnetic Recording Media},
author = {Risner, Juliet D. and Nolan, T. P. and Bentley, James and Girt, E and HarknessIV, S. D. and Sinclair, Prof. Robert},
abstractNote = {For this analytical TEM study, nonmagnetic oxygen-rich boundaries were introduced into Co-Ptalloy perpendicular recording media by cosputtering Co and Pt with TiO2. Increasing the TiO2 content resulted in changes to the microstructure and elemental distribution within grains and boundaries in these films. EFTEM imaging was used to generate composition maps spanning many tens of grains, thereby giving an overall depiction of the changes in elemental distribution occurring with increasing TiO2 content. Comparing EFTEM with spectrum-imaging maps created by high-resolution STEM with EDXS and EELS enabled both corroboration of EFTEM results and quantification of the chemical composition within individual grain boundary areas. The difficulty of interpreting data from EDXS for these extremely thin films is discussed. Increasing the TiO2 content of the media was found to create more uniformly wide Ti- and O-rich grain boundaries as well as Ti- and O-rich regions within grains.},
doi = {10.1017/S1431927607070213},
journal = {Microscopy and Microanalysis},
number = 2,
volume = 13,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}