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Low-field-induced spin-glass behavior and controllable anisotropy in nanoparticle assemblies at a liquid-air interface
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- Liao, Xiaoqi (author)
- Uppsala universitet,Fasta tillståndets fysik,Shenzhen Univ, Coll Phys & Optoelect Engn, Shenzhen 518060, Peoples R China.;Hanshan Normal Univ, Sch Mat Sci & Engn, Chaozhou 521041, Peoples R China.;Uppsala Univ, Dept Mat Sci & Engn, Angstrom Lab, Solid State Phys, Box 35, S-75103 Uppsala, Sweden.
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- Ulusoy, Seda (author)
- Uppsala universitet,Fasta tillståndets fysik
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- Huang, Rui (author)
- Hanshan Normal Univ, Sch Mat Sci & Engn, Chaozhou 521041, Peoples R China.
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- (creator_code:org_t)
- 2021-07-21
- 2022
- English.
- In: SCIENCE CHINA-MATERIALS. - : Springer Nature. - 2095-8226 .- 2199-4501. ; 65:1, s. 193-200
- Journal article (peer-reviewed)
Abstract
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- Stacking nanoscale-building blocks into one-dimensional (1D) assemblies with collective physical properties is a frontier in designing materials. However, the formation of 1D arrays using weak magnetic fields and an in-depth understanding of their magnetic properties remain challenging. Here, low-dimensional assemblies of iron oxide nanocubes with a disordered arrangement are fabricated at the diethylene-glycol/air interface in the presence of assembly fields (0/1/3/5/30/50 mT). Ring-shaped assemblies gradually transform as the assembly field increases from 0 to 50 mT, first to a porous network consisting of elongated assemblies and then to an aligned array of filaments, in which the aligned filaments are formed when the assembly field is >= 3 mT and duration t > 14 min. Spin-glass characteristics and static (dynamic) anisotropy factors similar to 2(3) are achieved by tuning the strength of the assembly field. In the presence of a relatively weak assembly field, the interplay between dipolar interactions and disorder with respect to magnetic easy axis alignment leads to spin-glass characteristics. The alignment of the magnetic easy axes and the strength of the dipolar interactions increase with increasing assembly field, resulting in the disappearance of spin-glass characteristics and enhancement of the magnetic anisotropy. This study presents a strategy for obtaining magnetic assemblies with spin-glass behavior and controllable anisotropy while shedding light on the magnetic interactions of low-dimensional assemblies.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Keyword
- magnetic nanoparticles
- assembly
- anisotropy
- spin glass
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- ref (subject category)
- art (subject category)
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- Liao, Xiaoqi
- Ulusoy, Seda
- Huang, Rui
- Wetterskog, Erik
- Gunnarsson, Klas
- Wang, Yu
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- Liang, Huawei
- Zeng, Yu-Jia
- Salazar-Alvarez, ...
- Svedlindh, Peter
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