Journal
SMALL
Volume 15, Issue 1, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201804557
Keywords
chiral molecules; magnetic memory; magnetic nanoparticles; spintronics; superparamagnetism
Categories
Funding
- Volkswagen Foundation [VW 88 367]
- Israel Science Foundation (ISF) [1589/14, 1248/10]
- MOS Israel
- European Research Council under the European Union's Seventh Framework Program (No. FP7/2007-2013)/ERC Grant [338720]
- VW Foundation [VW 88 367]
- U.S. Department of Energy [ER46430]
- European Research Council (ERC) [338720] Funding Source: European Research Council (ERC)
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The rapid growth in demand for data and the emerging applications of Big Data require the increase of memory capacity. Magnetic memory devices are among the leading technologies for meeting this demand; however, they rely on the use of ferromagnets that creates size reduction limitations and poses complex materials requirements. Usually magnetic memory sizes are limited to 30-50 nm. Reducing the size even further, to the approximate to 10-20 nm scale, destabilizes the magnetization and its magnetic orientation becomes susceptible to thermal fluctuations and stray magnetic fields. In the present work, it is shown that 10 nm single domain ferromagnetism can be achieved. Using asymmetric adsorption of chiral molecules, superparamagnetic iron oxide nanoparticles become ferromagnetic with an average coercive field of approximate to 80 Oe. The asymmetric adsorption of molecules stabilizes the magnetization direction at room temperature and the orientation is found to depend on the handedness of the chiral molecules. These studies point to a novel method for the miniaturization of ferromagnets (down to approximate to 10 nm) using established synthetic protocols.
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