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Title: Shaping nanoscale magnetic domain memory in exchange-coupled ferromagnets by field cooling

Abstract

The advance of magnetic nanotechnologies relies on detailed understanding of nanoscale magnetic mechanisms in materials. Magnetic domain memory (MDM), that is, the tendency for magnetic domains to repeat the same pattern during field cycling, is important for magnetic recording technologies. Here we demonstrate MDM in [Co/Pd]/IrMn films, using coherent X-ray scattering. Under illumination, the magnetic domains in [Co/Pd] produce a speckle pattern, a unique fingerprint of their nanoscale configuration. We measure MDM by cross-correlating speckle patterns throughout magnetization processes. When cooled below its blocking temperature, the film exhibits up to 100% MDM, induced by exchange-coupling with the underlying IrMn layer. The degree of MDM drastically depends on cooling conditions. If the film is cooled under moderate fields, MDM is high throughout the entire magnetization loop. Lastly, if the film is cooled under nearly saturating field, MDM vanishes, except at nucleation and saturation. Our findings show how to fully control the occurrence of MDM by field cooling.

Authors:
 [1];  [1];  [1]; ORCiD logo [2]
  1. Brigham Young Univ., Provo, UT (United States). Dept. of Physics and Astronomy
  2. Univ. of California San Diego, La Jolla, CA (United States). Center for Memory and Recording Research
Publication Date:
Research Org.:
Brigham Young Univ., Provo, UT (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1280967
Grant/Contract Number:  
SC0003678
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; x-ray; thin-films; anisotropy; spintronics; multilayers; reversal

Citation Formats

Chesnel, Karine, Safsten, Alex, Rytting, Matthew, and Fullerton, Eric E. Shaping nanoscale magnetic domain memory in exchange-coupled ferromagnets by field cooling. United States: N. p., 2016. Web. https://doi.org/10.1038/ncomms11648.
Chesnel, Karine, Safsten, Alex, Rytting, Matthew, & Fullerton, Eric E. Shaping nanoscale magnetic domain memory in exchange-coupled ferromagnets by field cooling. United States. https://doi.org/10.1038/ncomms11648
Chesnel, Karine, Safsten, Alex, Rytting, Matthew, and Fullerton, Eric E. Wed . "Shaping nanoscale magnetic domain memory in exchange-coupled ferromagnets by field cooling". United States. https://doi.org/10.1038/ncomms11648. https://www.osti.gov/servlets/purl/1280967.
@article{osti_1280967,
title = {Shaping nanoscale magnetic domain memory in exchange-coupled ferromagnets by field cooling},
author = {Chesnel, Karine and Safsten, Alex and Rytting, Matthew and Fullerton, Eric E.},
abstractNote = {The advance of magnetic nanotechnologies relies on detailed understanding of nanoscale magnetic mechanisms in materials. Magnetic domain memory (MDM), that is, the tendency for magnetic domains to repeat the same pattern during field cycling, is important for magnetic recording technologies. Here we demonstrate MDM in [Co/Pd]/IrMn films, using coherent X-ray scattering. Under illumination, the magnetic domains in [Co/Pd] produce a speckle pattern, a unique fingerprint of their nanoscale configuration. We measure MDM by cross-correlating speckle patterns throughout magnetization processes. When cooled below its blocking temperature, the film exhibits up to 100% MDM, induced by exchange-coupling with the underlying IrMn layer. The degree of MDM drastically depends on cooling conditions. If the film is cooled under moderate fields, MDM is high throughout the entire magnetization loop. Lastly, if the film is cooled under nearly saturating field, MDM vanishes, except at nucleation and saturation. Our findings show how to fully control the occurrence of MDM by field cooling.},
doi = {10.1038/ncomms11648},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {2016},
month = {6}
}

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