Magnetic properties of perpendicularly orientated L1_0 FePt nanoparticles  

作　　者：MO XiaoJing XIANG Hui LI GuoQing CHEN Peng XIONG ZuHong WANG JunZhong ISHIO ShunJi SMTO Hitoshi SHIMA ToshiYuki TAKANASHI KoKi 

机构地区：[1]School of Physics Science and Technology, Southwestern University, Chongqing 400715, China [2]Faculty of Engineering and Resource Science, Akita University, Akita 010-8502, Japan [3]Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

出　　处：《Chinese Science Bulletin》2010年第8期680-686,共7页

基　　金：supported by Chongqing Natural Science Foundation(Grant No.CSTC2009BB8102);Southwest University Doctorial Foundation (Grant No.SWUB2006031)

摘　　要：L10 FePt films were deposited on MgO (001) substrates heated to 700°C by magnetron sputtering.Assisted by the misfit of lattice between film and substrate,strong (001) texture was formed.The film at nominal thickness t N=5 nm was composed of nanoparticles with a size of～70 nm,and showed a high coercivity of～105 kOe at 4.2 K.At t N=～50 nm,as the film changed from discontinuous to continuous,the coercivity dropped about one order of magnitude.Micromagnetic simulation implies that the magnetization reversal is a vortex-like nuclear type.The ideal coercivity of a separated single-domain L10 FePt nanoparticle with a size of 70 nm×70 nm×5 nm is～121 kOe.This tells us that the experimental coercivity has nearly reached the limit of ideal single crystalline nanoparticles.L10 FePt films were deposited on MgO （001） substrates heated to 700℃ by magnetron sputtering. Assisted by the misfit of lattice between film and substrate, strong （001） texture was formed. The film at nominal thickness tN = 5 nm was composed of nanopar- ficles with a size of N70 nm, and showed a high coercivity of -105 kOe at 4.2 K. At tN =N50 nm, as the film changed from discontinuous to continuous, the coercivity dropped about one order of magnitude. Micromagnetic simulation implies that the magnetization reversal is a vortex-like nuclear type. The ideal coercivity of a separated single-domain L10 FePt nanoparticle with a size of 70 nm×70 nm× 5 nm is -121 kOe. This tells us that the experimental coercivity has nearly reached the limit of ideal single crystalline nanoparticles.

关 键 词：磁性纳米粒子 合金薄膜 FEPT 相机 MGO(001) 金纳米颗粒 高矫顽力 取向 

分 类 号：O614.22[理学—无机化学] Q523[理学—化学]