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Title: Quantification of intergranular exchange coupling in CoPtCr-based perpendicular recording media via ferromagnetic resonance measurements

Abstract

In this study, intergranular exchange fields in CoPtCr granular media materials were quantified through ferromagnetic resonance measurements in various magnetic states. The data indicate that the exchange field in CoPtCr granular films with no oxide segregant is comparable to the saturation magnetization of the films. With an introduction of a SiO 2 segregant, however, the exchange field decreases. A 30% volume fraction of the segregant reduces the strength of the intergranular exchange coupling to zero.

Authors:
 [1];  [2];  [1];  [1]
  1. Colorado State Univ., Fort Collins, CO (United States)
  2. Western Digital, San Jose, CA (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1470132
Alternate Identifier(s):
OSTI ID: 1406651
Grant/Contract Number:  
SC0012670
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 111; Journal Issue: 18; Related Information: SHINES partners with University of California, Riverside (lead); Arizona State University; Colorado State University; Johns Hopkins University; University of California Irvine; University of California Los Angeles; University of Texas at Austin; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; phonons; thermal conductivity; thermoelectric; spin dynamics; spintronics

Citation Formats

Richardson, Daniel, Srinivasan, Kumar, Katz, Sidney, and Wu, Mingzhong. Quantification of intergranular exchange coupling in CoPtCr-based perpendicular recording media via ferromagnetic resonance measurements. United States: N. p., 2017. Web. doi:10.1063/1.4990949.
Richardson, Daniel, Srinivasan, Kumar, Katz, Sidney, & Wu, Mingzhong. Quantification of intergranular exchange coupling in CoPtCr-based perpendicular recording media via ferromagnetic resonance measurements. United States. doi:10.1063/1.4990949.
Richardson, Daniel, Srinivasan, Kumar, Katz, Sidney, and Wu, Mingzhong. Thu . "Quantification of intergranular exchange coupling in CoPtCr-based perpendicular recording media via ferromagnetic resonance measurements". United States. doi:10.1063/1.4990949. https://www.osti.gov/servlets/purl/1470132.
@article{osti_1470132,
title = {Quantification of intergranular exchange coupling in CoPtCr-based perpendicular recording media via ferromagnetic resonance measurements},
author = {Richardson, Daniel and Srinivasan, Kumar and Katz, Sidney and Wu, Mingzhong},
abstractNote = {In this study, intergranular exchange fields in CoPtCr granular media materials were quantified through ferromagnetic resonance measurements in various magnetic states. The data indicate that the exchange field in CoPtCr granular films with no oxide segregant is comparable to the saturation magnetization of the films. With an introduction of a SiO2 segregant, however, the exchange field decreases. A 30% volume fraction of the segregant reduces the strength of the intergranular exchange coupling to zero.},
doi = {10.1063/1.4990949},
journal = {Applied Physics Letters},
number = 18,
volume = 111,
place = {United States},
year = {2017},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
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Figures / Tables:

FIG. 1 FIG. 1: Static magnetic properties of the samples. (a)–(c) The saturation induction 4more » $\pi$$M_{s}$, effective perpendicular anisotropy field Hk, and coercivity Hc as a function of the volume fraction of the SiO2 segregant. (d) The magnetic hysteresis loops of the four samples, where the vertical axis shows the remnant magnetization Mr to saturation magnetization Ms ratio.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.