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

Chesnel, Karine; Safsten, Alex; Rytting, Matthew; Fullerton, Eric E.

doi:10.1038/ncomms11648

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

Journal Article · Wed Jun 01 00:00:00 EDT 2016 · Nature Communications

DOI:https://doi.org/10.1038/ncomms11648· OSTI ID:1280967

Chesnel, Karine ^[1]; Safsten, Alex ^[1]; Rytting, Matthew ^[1];

^[2]

Brigham Young Univ., Provo, UT (United States). Dept. of Physics and Astronomy
Univ. of California San Diego, La Jolla, CA (United States). Center for Memory and Recording Research

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.

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Research Organization:: Brigham Young Univ., Provo, UT (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0003678

OSTI ID:: 1280967

Journal Information:: Nature Communications, Vol. 7; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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

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