skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Thermal transitions in nano-patterned XY-magnets

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) Center for Functional Nanomaterials
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1163333
Report Number(s):
BNL-106297-2014-JA
R&D Project: 16062; KC0403020
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 4
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; functional nanomaterials

Citation Formats

Arnalds U. B., Stein A., Ahlberg, M., Brewer, M., Kapaklis, V., Papaioannou, E., Karimipour, M., Korelis, P., Olafsson, S., Hase, T., and Hjorvarsson, B. Thermal transitions in nano-patterned XY-magnets. United States: N. p., 2014. Web. doi:10.1063/1.4891479.
Arnalds U. B., Stein A., Ahlberg, M., Brewer, M., Kapaklis, V., Papaioannou, E., Karimipour, M., Korelis, P., Olafsson, S., Hase, T., & Hjorvarsson, B. Thermal transitions in nano-patterned XY-magnets. United States. doi:10.1063/1.4891479.
Arnalds U. B., Stein A., Ahlberg, M., Brewer, M., Kapaklis, V., Papaioannou, E., Karimipour, M., Korelis, P., Olafsson, S., Hase, T., and Hjorvarsson, B. Wed . "Thermal transitions in nano-patterned XY-magnets". United States. doi:10.1063/1.4891479.
@article{osti_1163333,
title = {Thermal transitions in nano-patterned XY-magnets},
author = {Arnalds U. B. and Stein A. and Ahlberg, M. and Brewer, M. and Kapaklis, V. and Papaioannou, E. and Karimipour, M. and Korelis, P. and Olafsson, S. and Hase, T. and Hjorvarsson, B.},
abstractNote = {},
doi = {10.1063/1.4891479},
journal = {Applied Physics Letters},
number = 4,
volume = 105,
place = {United States},
year = {Wed Jul 30 00:00:00 EDT 2014},
month = {Wed Jul 30 00:00:00 EDT 2014}
}
  • Two models of classic XY antiferromagnets in three dimensions are studied by Monte Carlo simulation: the model on a simple cubic lattice with two extra intralayer exchanges and the model on a stackedtriangular lattice with an extra interlayer exchange. In suggested models, the order parameters are magnetization and two chiral parameters. A transition corresponds to breaking Double-Struck-Capital-Z {sub 2} Circled-Times Double-Struck-Capital-Z {sub 2} Circled-Times SO(2) symmetry. A distinct first order transition is found in both models.
  • A description of a dislocation-free elastic glass phase in terms of domain walls is developed and used as the basis of a renormalization group analysis of the energetics of dislocation loops added to the system. It is found that even after optimizing over possible paths of large dislocation loops, their energy is still very likely to be positive when the dislocation core energy is large. This implies the existence of an equilibrium elastic glass phase in three-dimensional random field XY magnets, and a dislocation-free, bond orientationally ordered {open_quotes}Bragg glass{close_quote}{close_quote} phase of vortices in dirty type-II superconductors. {copyright} {ital 1997} {italmore » The American Physical Society}« less
  • We report here surface x-ray scattering studies of the adsorption of simple hydrocarbon liquid films on nanostructured surfaces-silicon patterned by an array of nanocavities. Two different regimes, filling and growing, are observed for the wetting film evolution as a function of the chemical potential offset from the bulk liquid-vapor coexistence. The strong influence of geometrical effects is manifested by a dependence of liquid adsorption in the nanocavities that is stronger than the van der Waals behavior for flat surfaces. The observed dependence is, however, much weaker than predicted for the infinitely deep parabolic cavities, suggesting that the finite-size effects contributemore » significantly to the observed adsorption behavior.« less
  • Nb films containing extended arrays of holes with 45-nm diameter and 100-nm spacing have been fabricated using anodized aluminum oxide as substrate. Pronounced matching effects in the magnetization and Little-Parks oscillations of the superconducting critical temperature have been observed in fields up to 9 kOe. Flux pinning in the patterned samples is significantly enhanced as compared to unpatterned reference samples in applied fields exceeding 5 kOe. Matching effects are a dominant contribution to vortex pinning at temperatures as low as 4.2 K due to the extremely small spacing of the holes.
  • Very large scale integration of Josephson junctions in a two-dimensional series-parallel array has been achieved by ion irradiating a YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} film through slits in a nano-fabricated mask created with electron beam lithography and reactive ion etching. The mask consisted of 15,820 high-aspect ratio (20:1), 35-nm wide slits that restricted the irradiation in the film below to form Josephson junctions. Characterizing each parallel segment k, containing 28 junctions, with a single critical current I{sub ck} we found a standard deviation in I{sub ck} of about 16%.