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Main Title: Thermally induced magnetic switching in bit-patterned media
Author(s): Pfau, Bastian
Günther, Christian Michael
Hauet, Thomas
Eisebitt, Stefan
Hellwig, O.
Type: Article
Abstract: We have studied the thermal variation of the switching field of magnetic islands at room temperature. A model bit-pattern media composed of an assembly of islands with 80 nm width was fabricated by sputter deposition onto a pre-patterned substrate. Using direct magnetic-contrast imaging of the islands under applied field, we extract the switching probabilities of individual islands. Based on an analytical model for the thermally activated switching of the islands, we are able to determine the intrinsic magnetic anisotropy of each island and, consequentially, a distribution of anisotropies for the island ensemble investigated. In the distribution, we identify a separated group of islands with a particularly small anisotropy. We attribute this group to islands containing misaligned grains triggering the magnetic reversal. At room temperature and slow field sweep rates, the observed thermal broadening of the switching-field distribution is small compared to the intrinsic broadening. However, we illustrate that thermal fluctuations play a crucial role at high sweep rates by extrapolating our results to technological relevant regimes.
Subject(s): data storage
data retrieval
sputter deposition
thermal fluctuations
Issue Date: 31-Jul-2017
Date Available: 18-May-2020
Language Code: en
DDC Class: 530 Physik
Journal Title: Journal of Applied Physics
Publisher: American Institute of Physics (AIP)
Volume: 122
Issue: 4
Article Number: 043907
Publisher DOI: 10.1063/1.4992808
EISSN: 1089-7550
ISSN: 0021-8979
Notes: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Journal of Applied Physics 122, 043907 (2017) and may be found at
TU Affiliation(s): Fak. 2 Mathematik und Naturwissenschaften » Inst. Optik und Atomare Physik » FG Röntgenoptik und Nanometer-Optik
Appears in Collections:Technische Universität Berlin » Publications

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