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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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Science China Materials 2022年第1期65卷 193-200页

作者： Xiaoqi Liao Seda Ulusoy Rui Huang Erik Wetterskog Klas Gunnarsson Yu Wang Huawei Liang Yu-Jia Zeng german salazar-alvarez Peter Svedlindh College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China School of Materials Science and Engineering Hanshan Normal UniversityChaozhou 521041China Solid State Physics Department of Materials Science and EngineeringAngstrom LaboratoryUppsala UniversityBox 3575103 UppsalaSweden MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter and State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China

Stacking nanoscale-building blocks into onedimensional(1D)assemblies with collective physical properties is a frontier in designing ***,the formation of 1D arrays using weak magnetic fields and an in-depth understanding of their magnetic properties remain ***,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 ***-glass characteristics and static(dynamic)anisotropy factors~2(3)are achieved by tuning the strength of the assembly *** 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 *** 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 *** 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.

关键词： magnetic nanoparticles assembly anisotropy spin glass

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Ellipsometric Study of SiOx Thin Films by Thermal Evaporation

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Open Journal of Inorganic Chemistry 2016年第3期6卷 175-182页

作者： David salazar Roberto Soto-Molina Eder german Lizarraga-Medina Marco Antonio Felix Nicola Radnev Heriberto Márquez Departamento de óptica CICESE Ensenada México Instituto de Ingeniería Universidad Autónoma de Baja California Mexicali México

This paper presents a study of amorphous SiOx thin films by means of Variable Angle Spectroscopic Ellipsometry (VASE) technique. Tauc Lorentz, Lorentz and Cauchy models have been used to obtain physical thickness and complex refractive index (n and k) from experimental data. In order to obtain a wide range to x stoichiometry values, the films were prepared by vacuum thermal evaporation of SiO on glass substrates, under different and controlled deposition conditions.

关键词： Ellipsometry Refraction Index SiOx Thin Films

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