High-Magnetization Tetragonal Ferrite-Based Films Induced by Carbon and Oxygen Vacancy Pairs

作     者：Xiao, Wen Yang, Yang Chi, Xiao Liu, Binghai Du, Yonghua Yang, Ping Herng, Tun Seng Gao, Daqiang Song, Wendong Feng, Yuan Ping Rusydi, Andrivo Ding, Jun 

作者机构：Natl Univ Singapore Dept Mat Sci & Engn 9 Engn Dr 1 Singapore 117575 Singapore Shenzhen Univ Coll Elect Sci & Technol Shenzhen 518060 Peoples R China Natl Univ Singapore Dept Phys 2 Sci Dr 3 Singapore 117542 Singapore Natl Univ Singapore Singapore Synchrotron Light Source 5 Res Link Singapore 117603 Singapore Singapore Pte Ltd Dept Prod Test & Failure Anal GLOBALFOUNDRIES Singapore 738406 Singapore ASTAR Inst Chem & Engn Sci 1 Pesek Rd Singapore 627833 Singapore Lanzhou Univ Key Lab Magnetism & Magnet Mat MOE Key Lab Special Funct Mat & Struct Design MOE Lanzhou 730000 Gansu Peoples R China ASTAR Agcy Sci Technol & Res Data Storage Inst 2 Fusionopolis Way08-01 Innovis Singapore 138634 Singapore 

出 版 物：《ACS APPLIED MATERIALS & INTERFACES》 (美国化学会应用材料与界面)

年 卷 期：2019年第11卷第1期

页      面：1049-1056页

核心收录：

学科分类：0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：NUS [R261-509-001-646, R261-509-001-733] NRF [CRP16-2015-01 (R284-000-159-281)] National Natural Science Foundation of China (NSFC) 

主　　题：high magnetization ferrite tetragonal film thermal decomposition first-principles calculations 

摘      要：Herein, a low-temperature thermal decomposition method is utilized to grow new stable tetragonal Fe3O4-based thick ferrite films. The tetragonal Fe3O4-based film possesses high saturation magnetization of similar to 800 emu/cm(3). Doping with approximately 10% Co results in a highenergy product of 40.9 MGOe with perpendicular magneto crystalline anisotropy, whereas doping with Ni increases electrical resistivity by a factor of 6 and retains excellent soft magnetic properties (high saturation magnetization and low coercivity). A combined experimental and first-principles study reveals that carbon interstitials (C-i(B)) and oxygen vacancies (V-O) form C-i(B)-V-O pairs which stabilize the tetragonal phase and enhance saturation magnetization. The magnetization enhancement is further attributed to local ferromagnetic coupling between Fe, and FeB induced by C-i(B)-V-O pairs in a tetragonal spinel ferrite lattice.