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Title: Characterization of switching field distributions in Ising-like magnetic arrays

Abstract

The switching field distribution within arrays of single-domain ferromagnetic islands incorporates both island-island interactions and quenched disorder in island geometry. Separating these two contributions is important for disentangling the effects of disorder and interactions in themagnetization dynamics of island arrays. Using submicron, spatially resolved Kerr imaging in an external magnetic field for islands with perpendicular magnetic anisotropy, we map out the evolution of island arrays during hysteresis loops. Resolving and tracking individual islands across four different lattice types and a range of interisland spacings, we can extract the individual switching fields of every island and thereby quantitatively determine the contributions of interactions and quenched disorder in the arrays. The width of the switching field distribution is found to be well fitted by a simple model comprising the sum of an array-independent contribution (interpreted as disorder induced) and a term proportional to the maximum field the entire rest of the array could exert on a single island, i.e., in a fully polarized state. This supports the claim that disorder in these arrays is primarily a single-island property and provides a methodology by which to quantify such disorder.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division
OSTI Identifier:
1376059
DOE Contract Number:
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 95; Journal Issue: 14
Country of Publication:
United States
Language:
English

Citation Formats

Fraleigh, Robert D., Kempinger, Susan, Lammert, Paul E., Zhang, Sheng, Crespi, Vincent H., Schiffer, Peter, and Samarth, Nitin. Characterization of switching field distributions in Ising-like magnetic arrays. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.144416.
Fraleigh, Robert D., Kempinger, Susan, Lammert, Paul E., Zhang, Sheng, Crespi, Vincent H., Schiffer, Peter, & Samarth, Nitin. Characterization of switching field distributions in Ising-like magnetic arrays. United States. doi:10.1103/PhysRevB.95.144416.
Fraleigh, Robert D., Kempinger, Susan, Lammert, Paul E., Zhang, Sheng, Crespi, Vincent H., Schiffer, Peter, and Samarth, Nitin. Sat . "Characterization of switching field distributions in Ising-like magnetic arrays". United States. doi:10.1103/PhysRevB.95.144416.
@article{osti_1376059,
title = {Characterization of switching field distributions in Ising-like magnetic arrays},
author = {Fraleigh, Robert D. and Kempinger, Susan and Lammert, Paul E. and Zhang, Sheng and Crespi, Vincent H. and Schiffer, Peter and Samarth, Nitin},
abstractNote = {The switching field distribution within arrays of single-domain ferromagnetic islands incorporates both island-island interactions and quenched disorder in island geometry. Separating these two contributions is important for disentangling the effects of disorder and interactions in themagnetization dynamics of island arrays. Using submicron, spatially resolved Kerr imaging in an external magnetic field for islands with perpendicular magnetic anisotropy, we map out the evolution of island arrays during hysteresis loops. Resolving and tracking individual islands across four different lattice types and a range of interisland spacings, we can extract the individual switching fields of every island and thereby quantitatively determine the contributions of interactions and quenched disorder in the arrays. The width of the switching field distribution is found to be well fitted by a simple model comprising the sum of an array-independent contribution (interpreted as disorder induced) and a term proportional to the maximum field the entire rest of the array could exert on a single island, i.e., in a fully polarized state. This supports the claim that disorder in these arrays is primarily a single-island property and provides a methodology by which to quantify such disorder.},
doi = {10.1103/PhysRevB.95.144416},
journal = {Physical Review B},
number = 14,
volume = 95,
place = {United States},
year = {Sat Apr 01 00:00:00 EDT 2017},
month = {Sat Apr 01 00:00:00 EDT 2017}
}