Magnetochromic sensing and size-dependent collective excitations in iron oxide nanoparticles

Source Publication (e.g., journal title)

Physical Review B

Authors

Kenneth Robert O'NealFollow
J M. Patete, State University of New York at Stony Brook
P Chen, University of Tennessee, Knoxville
R Nanavati, State University of New York at Stony Brook
Brian S. Holinsworth, University of Tennessee, Knoxville
J M. Smith, State University of New York at Stony Brook
C Marques, SUNY Stony Brook
J W. Simonson, Farmingdale State University of New York
M C. Aronson, SUNY Stony Brook
Stephen A. McGill, Florida State University
S S. Wong, State University of New York at Stony Brook
Janice L. Musfeldt, University of Tennessee, Knoxville

Document Type

Article

Publication Date

3-10-2017

DOI

10.1103/PhysRevB.95.125416

Abstract

We combine optical and magneto-optical spectroscopies with complementary vibrational and magnetic property measurements to reveal finite length scale effects in nanoscale α-Fe2O3. Analysis of the d-to-d on-site excitations uncovers enhanced color contrast at particle sizes below approximately 75 nm due to size-induced changes in spin-charge coupling that are suppressed again below the superparamagnetic limit. These findings provide a general strategy for amplifying magnetochromism in α-Fe2O3 and other iron-containing nanomaterials that may be useful for advanced sensing applications.We also unravel the size dependence of collective excitations in this iconic antiferromagnet.

Recommended Citation

O'Neal, Kenneth Robert; Patete, J M.; Chen, P; Nanavati, R; Holinsworth, Brian S.; Smith, J M.; Marques, C; Simonson, J W.; Aronson, M C.; McGill, Stephen A.; Wong, S S.; and Musfeldt, Janice L., "Magnetochromic sensing and size-dependent collective excitations in iron oxide nanoparticles" (2017). Chemistry Publications and Other Works.
https://trace.tennessee.edu/utk_chempubs/54

Submission Type

Post-print