Single Domain 10 nm Ferromagnetism Imprinted on Superparamagnetic Nanoparticles Using Chiral Molecules

Koplovitz, Guy; Leitus, Gregory; Ghosh, Supriya; Bloom, Brian P.; Yochelis, Shira; Rotem, Dvir; Vischio, Fabio; Striccoli, Marinella; Fanizza, Elisabetta; Naaman, Ron; Waldeck, David H.; Porath, Danny; Paltiel, Yossi

doi:10.1002/smll.201804557

Title: Single Domain 10 nm Ferromagnetism Imprinted on Superparamagnetic Nanoparticles Using Chiral Molecules

Journal Article · Wed Nov 21 00:00:00 EST 2018 · Small

DOI:https://doi.org/10.1002/smll.201804557· OSTI ID:1604934

Koplovitz, Guy ^[1]; Leitus, Gregory ^[2]; Ghosh, Supriya ^[3]; Bloom, Brian P. ^[3]; Yochelis, Shira ^[1]; Rotem, Dvir ^[1]; Vischio, Fabio ^[4]; Striccoli, Marinella ^[4]; Fanizza, Elisabetta ^[5]; Naaman, Ron ^[2]; Waldeck, David H. ^[3]; Porath, Danny ^[1];

^[1]

Hebrew Univ. of Jerusalem (Israel)
Weizmann Inst. of Science, Rehovot (Israel)
Univ. of Pittsburgh, PA (United States)
National Research Council (CNR), Bari (Italy). Inst. for Chemical and Physical Processes (IPCF)
Univ. degli Studi di Bari (Italy)

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. Typically magnetic memory sizes are limited to 30–50 nm. Reducing the size even further, to the ≈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 ≈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 works point to a novel method for the miniaturization of ferromagnets (down to ≈10 nm) using established synthetic protocols.

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Research Organization:: Univ. of Pittsburgh, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Volkswagen Foundation; Israel Science Foundation; European Research Council (ERC)

Grant/Contract Number:: FG02-07ER46430; FP7/2007‐2013

OSTI ID:: 1604934

Alternate ID(s):: OSTI ID: 1483026

Journal Information:: Small, Vol. 15, Issue 1; ISSN 1613-6810

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 29 works

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Light-driven molecular switch for reconfigurable spin filters Suda, Masayuki; Thathong, Yuranan; Promarak, Vinich Nature Communications, Vol. 10, Issue 1 https://doi.org/10.1038/s41467-019-10423-6	journal	June 2019
Chiral molecules-ferromagnetic interfaces, an approach towards spin controlled interactions Naaman, Ron; Waldeck, David H.; Paltiel, Yossi Applied Physics Letters, Vol. 115, Issue 13 https://doi.org/10.1063/1.5125034	journal	September 2019
Influence of Magnetic Micelles on Assembly and Deposition of Porphyrin J-Aggregates Castriciano, Maria Angela; Trapani, Mariachiara; Romeo, Andrea Nanomaterials, Vol. 10, Issue 2 https://doi.org/10.3390/nano10020187	journal	January 2020

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