Jun DU
,
Ping ZHANG
材料科学技术（英文）
Ti-containing carbon films were deposited by using magnetron sputtering deposition. The composition and microstructure of the carbon films were characterized in detail by combining the techniques of Rutherford backscattering spectrometry (RBS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and transmission electron microscopy (TEM). It is found that carbon films contain Ti 18 at pct; after Ti incorporation, the films consist of titanium carbide; C1s peak appears at 283.4 eV and it could be divided into 283.29 and 284.55 eV, representing sp2 and sp3, respectively, and sp2 is superior to sp3. This Ti-containing film with dominating sp2 bonds is nanocomposites with nanocrystalline TiC clusters embedded in an amorphous carbon matrix, which could be proved by XRD and TEM.
关键词:
magnetic sputter deposition
,
磁控溅射
,
碳膜
Zhengyou ZHOU
,
Xiaoshan WU
,
Jun DU
金属学报(英文版)
doi:10.1016/S1006-7191(08)60070-8
Effects of soft-magnetic MnZn ferrite (Mn0.5Zn0.5Fe2O4, MZF) and hard-magnetic Ba
ferrite (BaO?6Fe2O3, BaM) on the structure and magnetic transport properties of [La2/3Sr1/3MnO3]
(LSMO)/(x) [ferrites] (ferrites=MZF, BaM) composites have been investigated. It was found that the inclusion of MZF phase reduces
magnetization and ferromagnetic-paramagnetic transition temperature (Tc) of the composites. With increasing the content of the
dopants, the high-temperature magnetoresistance (MR) decreases, whereas low-temperature MR increases and reaches 42% at 150~K and
x=0.1. However, for the LSMO/BaM composites, magnetization and ferromagnetic-paramagnetic transition temperature (Tc)
decrease firstly as x<5 %, and then increase as x>5 %. The resistivity of the composites increases by five orders of magnitude
at x=1 % and is out of measured range at x=5 %. High magnetic field has little effect on the resistivity and magnetoresistance for
the composites with x>5 %, which may originate from the pinning effect of BaM grains.
关键词:
Composites
,
null
,
null
,
null
