Modification of spin-ice physics in thin films
Abstract
We present an extensive study on the effect of substrate orientation, strain, stoichiometry, and defects on spin-ice physics in Ho2Ti2O7 thin films grown onto yttria-stabilized-zirconia substrates. We find that growth in different orientations produces different strain states in the films. All films exhibit similar c -axis lattice parameters for their relaxed portions, which are consistently larger than the bulk value of 10.1 Å. Transmission electron microscopy reveals antisite disorder and growth defects to be present in the films, but evidence of stuffing is not observed. The amount of disorder depends on the growth orientation, with the (110) film showing the least. Magnetization measurements at 1.8 K show the expected magnetic anisotropy and saturation magnetization values associated with a spin ice for all orientations; shape anisotropy is apparent when comparing in- and out-of-plane directions. Significantly, only the (110)-oriented films display the hallmark spin-ice plateau state in magnetization, albeit less well defined compared to the plateau observed in a single crystal. Neutron-scattering maps on the more disordered (111)-oriented films show the Q=0 phase previously observed in bulk materials, but the Q=X phase giving the plateau state remains elusive. We conclude that the spin-ice physics in thin films is modified by defects andmore »
- Authors:
-
- Florida State Univ., Tallahassee, FL (United States). Dept. of Physics; Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
- Stanford Univ., CA (United States). Stanford Nano Shared Facilities
- National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab); Univ. of Tennessee, Knoxville, TN (United States)
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab); Florida State Univ., Tallahassee, FL (United States). Dept. of Chemical and Biomedical Engineering
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1560624
- Alternate Identifier(s):
- OSTI ID: 1562767
- Grant/Contract Number:
- DMR-1847887; DMR-1606952; DMR-1644779; DMR-1157490; ECCS-1542152; DMR-1508249; AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Materials
- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 8; Journal ID: ISSN 2475-9953
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Barry, Kevin, Zhang, Biwen, Anand, Naween, Xin, Yan, Vailionis, Arturas, Neu, Jennifer, Heikes, Colin, Cochran, Charis, Zhou, Haidong, Qiu, Y., Ratcliff, William, Siegrist, Theo, and Beekman, Christianne. Modification of spin-ice physics in Ho2Ti2O7 thin films. United States: N. p., 2019.
Web. doi:10.1103/physrevmaterials.3.084412.
Barry, Kevin, Zhang, Biwen, Anand, Naween, Xin, Yan, Vailionis, Arturas, Neu, Jennifer, Heikes, Colin, Cochran, Charis, Zhou, Haidong, Qiu, Y., Ratcliff, William, Siegrist, Theo, & Beekman, Christianne. Modification of spin-ice physics in Ho2Ti2O7 thin films. United States. https://doi.org/10.1103/physrevmaterials.3.084412
Barry, Kevin, Zhang, Biwen, Anand, Naween, Xin, Yan, Vailionis, Arturas, Neu, Jennifer, Heikes, Colin, Cochran, Charis, Zhou, Haidong, Qiu, Y., Ratcliff, William, Siegrist, Theo, and Beekman, Christianne. Fri .
"Modification of spin-ice physics in Ho2Ti2O7 thin films". United States. https://doi.org/10.1103/physrevmaterials.3.084412. https://www.osti.gov/servlets/purl/1560624.
@article{osti_1560624,
title = {Modification of spin-ice physics in Ho2Ti2O7 thin films},
author = {Barry, Kevin and Zhang, Biwen and Anand, Naween and Xin, Yan and Vailionis, Arturas and Neu, Jennifer and Heikes, Colin and Cochran, Charis and Zhou, Haidong and Qiu, Y. and Ratcliff, William and Siegrist, Theo and Beekman, Christianne},
abstractNote = {We present an extensive study on the effect of substrate orientation, strain, stoichiometry, and defects on spin-ice physics in Ho2Ti2O7 thin films grown onto yttria-stabilized-zirconia substrates. We find that growth in different orientations produces different strain states in the films. All films exhibit similar c -axis lattice parameters for their relaxed portions, which are consistently larger than the bulk value of 10.1 Å. Transmission electron microscopy reveals antisite disorder and growth defects to be present in the films, but evidence of stuffing is not observed. The amount of disorder depends on the growth orientation, with the (110) film showing the least. Magnetization measurements at 1.8 K show the expected magnetic anisotropy and saturation magnetization values associated with a spin ice for all orientations; shape anisotropy is apparent when comparing in- and out-of-plane directions. Significantly, only the (110)-oriented films display the hallmark spin-ice plateau state in magnetization, albeit less well defined compared to the plateau observed in a single crystal. Neutron-scattering maps on the more disordered (111)-oriented films show the Q=0 phase previously observed in bulk materials, but the Q=X phase giving the plateau state remains elusive. We conclude that the spin-ice physics in thin films is modified by defects and strain, leading to a reduction in the temperature at which correlations drive the system into the spin-ice state.},
doi = {10.1103/physrevmaterials.3.084412},
journal = {Physical Review Materials},
number = 8,
volume = 3,
place = {United States},
year = {2019},
month = {8}
}
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