Effect of size confinement on skyrmionic properties of MnSi nanomagnets

Bhaskar Das, Balamurugan Balasubramanian, Ralph Skomski, Pinaki Mukherjee, Shah R. Valloppilly, George C. Hadjipanayis, David J. Sellmyer

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Bulk magnetic materials with the noncentrosymmetric cubic B20 structure are fascinating due to skyrmion spin structures associated with Dzyaloshinskii-Moriya interactions, but the size of skyrmions are generally larger than 50 nm. The control of such spin structures in the 10 nm size ranges is essential to explore them for spintronics, ultra-high-density magnetic recording, and other applications. In this study, we have fabricated MnSi nanoparticles with average sizes of 9.7, 13.1 and 17.7 nm and investigated their structural and magnetic properties. X-ray diffraction and transmission electron microscope studies show that the MnSi nanoparticles crystallize in the cubic B20 structure. Field-dependent dc susceptibility data of the MnSi samples with average particle sizes of 17.7 and 13.1 nm show anomalies in limited field (about 25-400 Oe) and temperature (25 K-43 K) ranges. These features are similar to the signature of the skyrmion-like spin structures observed below the Curie temperature of MnSi. Our results also show that this anomalous behavior is size-dependent and suppressed in the smallest nanoparticles (9.7 nm), and this suppression is interpreted as a confinement effect that leads to a truncation of the skyrmion structure.

Original languageEnglish (US)
Pages (from-to)9504-9508
Number of pages5
JournalNanoscale
Volume10
Issue number20
DOIs
Publication statusPublished - May 28 2018

    Fingerprint

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Das, B., Balasubramanian, B., Skomski, R., Mukherjee, P., Valloppilly, S. R., Hadjipanayis, G. C., & Sellmyer, D. J. (2018). Effect of size confinement on skyrmionic properties of MnSi nanomagnets. Nanoscale, 10(20), 9504-9508. https://doi.org/10.1039/c7nr08864g