Bi_(26-x-y)M_(x)N_(y)O_(40)(M,N=Fe,Co,Gd)软铋矿薄膜的制备和强磁光效应  

Preparation and Strong Magneto-Optical Effect of Bi_(26-x-y)M_(x)N_(y)O_(40)(M,N=Fe,Co,Gd)Sillenite Type Films

作　　者：高腾 邢锟 吴功辉 陈新 胡晓琳[1,2] 庄乃锋 GAO Teng;XING Kun;WU Gonghui;CHEN Xin;HU Xiaolin;ZHUANG Naifeng(College of Chemical, Fuzhou University, Fuzhou 350108, China;Institute of Optical Crystalline Materials, Fuzhou University, Fuzhou 350108, China)

机构地区：[1]福州大学化学学院,福州350108 [2]福州大学光功能晶态材料研究所,福州350108

出　　处：《人工晶体学报》2021年第9期1655-1661,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(61875039,51772052);福建省自然科学基金(2019J01206)。

摘　　要：磁光材料是现代光通信产业中不可或缺的关键功能材料。为了实现光通信器件的小型化,高质量磁光薄膜材料受到关注。软铋矿型Bi_(25)FeO_(40)具有高对称性的立方晶体结构,单位体积所含铋离子浓度高,理论上应具有较强的磁光效应,但却因为磁性偏弱、制备困难等缺点而限制了其应用。本文采用射频磁控溅射法,在掺钇二氧化锆(YSZ)基底上沉积获得具有立方相软铋矿型结构的Bi_(26-x-y)M_(x)N_(y)O_(40)(M,N=Fe,Co,Gd)磁光薄膜,并对其形貌、磁性、透过率、磁圆二色信号等进行表征。结果表明,薄膜均较为平整,厚度约为190 nm,在近红外区的透过率约为60%~70%。薄膜的磁性随着掺杂离子含量的提高逐渐增强。Bi_(13.6)Gd_(2.7)Co_(4.0)Fe_(5.7)O_(40)/YSZ薄膜具有强磁光效应,在716 nm处的磁圆二色光谱信号高达到1710 deg/cm,有望应用于集成光隔离器等光通信器件中。Magneto-optical materials are the indispensable and key functional materials in the field of modern optical communication.For the miniaturization of devices,high quality magneto-optical thin films have attracted much attention.The sillenite type Bi25FeO40 has a cubic crystal structure with high symmetry.The concentration of bismuth ions per unit volume is high,so it should have a strong magneto-optical effect in theory.However,its application is restricted due to low magnetism and difficulty in preparation.In this paper,Bi_(26-x-y)M_(x)N_(y)O_(40)(M,N=Fe,Co,Gd)magneto-optical thin films with cubic sillenite type were deposited on yttrium-doped zirconium dioxide(YSZ)substrate by the magnetron sputtering method.Their morphology,magnetic properties,transmittance,and magnetic circle dichroism were discussed.Smooth surface morphology of the films was observed by atom force microscope.The thickness of the films is about 190 nm.The valence states of bismuth,iron and cobalt in the films are all+3,and other valence states are not observed,so they are meeting the charge balance.The transmittance in the near infrared region is about 60%to 70%.At room temperature,the films show superparamagnetic effect,and the magnetic properties gradually increase with the increase of doping ion concentration.And the saturation magnetization of Bi_(13.6)Gd_(2.7)Co_(4.0)Fe_(5.7)O_(40)/YSZ film reaches 29 emu/cm^(3).The Bi_(13.6)Gd_(2.7)Co_(4.0)Fe_(5.7)O_(40)/YSZ film exhibits a strong magneto-optical effect,the magnetic circular dichroic spectrum signal is up to 1710 deg/cm at wavelength of 716 nm.Therefore,Bi_(13.6)Gd_(2.7)Co_(4.0)Fe_(5.7)O_(40)/YSZ film is expected to be used in integrated optical isolators and other optical communication devices.

关 键 词：磁光效应 磁圆二色光谱 Bi_(26-x-y)M_(x)N_(y)O_(40)薄膜 软铋矿 磁控溅射法 磁性质 

分 类 号：O734[理学—晶体学] TB383[一般工业技术—材料科学与工程]