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Title: Extracting magnetic cluster size and its distributions in advanced perpendicular recording media with shrinking grain size using small angle x-ray scattering

Abstract

We analyze the magnetic cluster size (MCS) and magnetic cluster size distribution (MCSD) in a variety of perpendicular magnetic recording (PMR) media designs using resonant small angle x-ray scattering at the Co L{sub 3} absorption edge. The different PMR media flavors considered here vary in grain size between 7.5 and 9.5 nm as well as in lateral inter-granular exchange strength, which is controlled via the segregant amount. While for high inter-granular exchange, the MCS increases rapidly for grain sizes below 8.5 nm, we show that for increased amount of segregant with less exchange the MCS remains relatively small, even for grain sizes of 7.5 and 8 nm. However, the MCSD still increases sharply when shrinking grains from 8 to 7.5 nm. We show evidence that recording performance such as signal-to-noise-ratio on the spin stand correlates well with the product of magnetic cluster size and magnetic cluster size distribution.

Authors:
; ; ; ;  [1];  [2];  [3]; ;  [4];  [5]; ; ;  [4]
  1. San Jose Research Center, HGST a Western Digital company, 3403 Yerba Buena Rd., San Jose, California 95135 (United States)
  2. Department of Materials Science and Engineering, Stanford University, Stanford, California 94035 (United States)
  3. (SIMES), SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025 (United States)
  4. Stanford Institute for Materials and Energy Science (SIMES), SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025 (United States)
  5. (United States)
Publication Date:
OSTI Identifier:
22402461
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 106; Journal Issue: 20; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; GRAIN SIZE; MAGNETIC PROPERTIES; MAGNETIC STORAGE DEVICES; PERFORMANCE; SMALL ANGLE SCATTERING; SPIN; X-RAY DIFFRACTION

Citation Formats

Mehta, Virat, Ikeda, Yoshihiro, Takano, Ken, Terris, Bruce D., Hellwig, Olav, Wang, Tianhan, Stanford Institute for Materials and Energy Science, Wu, Benny, Graves, Catherine, Department of Applied Physics, Stanford University, Stanford, California 94035, Dürr, Hermann A., Scherz, Andreas, and Stöhr, Jo. Extracting magnetic cluster size and its distributions in advanced perpendicular recording media with shrinking grain size using small angle x-ray scattering. United States: N. p., 2015. Web. doi:10.1063/1.4921403.
Mehta, Virat, Ikeda, Yoshihiro, Takano, Ken, Terris, Bruce D., Hellwig, Olav, Wang, Tianhan, Stanford Institute for Materials and Energy Science, Wu, Benny, Graves, Catherine, Department of Applied Physics, Stanford University, Stanford, California 94035, Dürr, Hermann A., Scherz, Andreas, & Stöhr, Jo. Extracting magnetic cluster size and its distributions in advanced perpendicular recording media with shrinking grain size using small angle x-ray scattering. United States. doi:10.1063/1.4921403.
Mehta, Virat, Ikeda, Yoshihiro, Takano, Ken, Terris, Bruce D., Hellwig, Olav, Wang, Tianhan, Stanford Institute for Materials and Energy Science, Wu, Benny, Graves, Catherine, Department of Applied Physics, Stanford University, Stanford, California 94035, Dürr, Hermann A., Scherz, Andreas, and Stöhr, Jo. Mon . "Extracting magnetic cluster size and its distributions in advanced perpendicular recording media with shrinking grain size using small angle x-ray scattering". United States. doi:10.1063/1.4921403.
@article{osti_22402461,
title = {Extracting magnetic cluster size and its distributions in advanced perpendicular recording media with shrinking grain size using small angle x-ray scattering},
author = {Mehta, Virat and Ikeda, Yoshihiro and Takano, Ken and Terris, Bruce D. and Hellwig, Olav and Wang, Tianhan and Stanford Institute for Materials and Energy Science and Wu, Benny and Graves, Catherine and Department of Applied Physics, Stanford University, Stanford, California 94035 and Dürr, Hermann A. and Scherz, Andreas and Stöhr, Jo},
abstractNote = {We analyze the magnetic cluster size (MCS) and magnetic cluster size distribution (MCSD) in a variety of perpendicular magnetic recording (PMR) media designs using resonant small angle x-ray scattering at the Co L{sub 3} absorption edge. The different PMR media flavors considered here vary in grain size between 7.5 and 9.5 nm as well as in lateral inter-granular exchange strength, which is controlled via the segregant amount. While for high inter-granular exchange, the MCS increases rapidly for grain sizes below 8.5 nm, we show that for increased amount of segregant with less exchange the MCS remains relatively small, even for grain sizes of 7.5 and 8 nm. However, the MCSD still increases sharply when shrinking grains from 8 to 7.5 nm. We show evidence that recording performance such as signal-to-noise-ratio on the spin stand correlates well with the product of magnetic cluster size and magnetic cluster size distribution.},
doi = {10.1063/1.4921403},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 20,
volume = 106,
place = {United States},
year = {2015},
month = {5}
}