拉曼光谱研究退火氧化镍中二阶磁振子散射增强  

Enhancement of two-magnon scattering in annealed nickel oxide studied by Raman spectroscopy

作　　者：宋梦婷 张悦 黄文娟[1,2] 候华毅 陈相柏 Song Meng-Ting;Zhang Yue;Huang Wen-Juan;Hou Hua-Yi;Chen Xiang-Bai(Hubei Key Laboratory of Optical Information and Pattern Recognition,Wuhan Institute of Technology,Wuhan 430205,China;State Key Laboratory of Material Processing and Die&Mould Technology,School of Material Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]武汉工程大学,光学信息与模式识别湖北省重点实验室,武汉430205 [2]华中科技大学材料科学与工程学院,材料成形与模具技术国家重点实验室,武汉430074

出　　处：《物理学报》2021年第16期272-277,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:51902227,11574241);华中科技大学材料成形与模具技术国家重点实验室开放课题研究基金(批准号:P2020-021)资助的课题。

摘　　要：运用激光拉曼光谱研究了450—1050℃退火处理对氧化镍中二阶磁振子散射的增强效应,同时分析了激光功率对氧化镍中二阶磁振子散射的影响.研究发现,退火处理可显著增强氧化镍中二阶磁振子散射,在450—1050℃范围内,退火温度越高,增强效应越明显,经过1050℃退火处理后二阶磁振子散射增强效应可达两个数量级以上.该显著增强效应与高温退火处理后氧化镍样品中镍缺陷的显著减少紧密相关,同时也与镍离子的晶格排列结构紧密相关.而且高温退火处理还可显著降低激光功率对氧化镍中二阶磁振子散射的影响.当退火温度较低时,氧化镍中二阶磁振子散射随激光功率的增加快速减弱并消失,而经过1050℃退火处理后,氧化镍中二阶磁振子散射在较高激光功率下仍非常显著.Laser Raman spectroscopy is used to study the enhancement effect of two-magnon scattering in nickel oxide through annealing treatment in a temperature range from 450℃to 1050℃,and investigate laser heating effect on two-magnon scattering.Our study shows that two-magnon scattering of nickel oxide can be tremendously enhanced with annealing temperature rising.In the temperature range from 450℃to 1050℃,the enhancement increases with annealing temperature increasing,and with 1050℃annealing the two-magnon scattering can be enhanced more than two orders of magnitude,also the enhancement of two-magnon scattering is much stronger than that of two-phonon scattering.This tremendous enhancement is correlated not only with the significant decrease of Ni-vacancy by high temperature annealing,but also with the magnetic spin ordering network of Ni ions.The variation of sensitive intensity of two-magnon scattering with the concentration of Nivacancy can be used to provide a simple Raman spectroscopy method of quantitatively measuring the Nivacancy in nickel oxide.In addition,the annealing treatment can significantly reduce the laser heating effect on two-magnon scatting in nickel oxide power samples.At low annealing temperature,the intensity of two-magnon scattering quickly quenches with increasing laser power.With 1050℃annealing,the laser heating effect on two-magnon scattering is significantly reduced and two-magnon scattering can still have strong intensity at high laser power.

关 键 词：二阶磁振子 拉曼光谱 退火 氧化镍 

分 类 号：O657.37[理学—分析化学] TQ138.13[理学—化学]