共查询到18条相似文献,搜索用时 62 毫秒
1.
纯铝化学镀CoNiP磁记录介质的研究 总被引:1,自引:0,他引:1
本文研究了用化学镀制取CoNiP磁记录介质的工艺,结果表明,对纯铝进行化学除油,酸蚀,一次浸锌和二次浸锌后,再化学镀CoNiP合金,该合金的磁性能为:Hc∥=26207.68A/m,Hc(⊥)=45408.64A;SQR(∥)=0.352,SQR(⊥)=0.083,可作为高密度磁记录介质使用。 相似文献
2.
采用化学湿法沉积制备了Co-Ni-P磁性薄膜,研究了工艺条件对其磁性的影响,并对其作为磁旋转编码器磁鼓记录介质的记录特性进行了分析。研究结果表明,薄膜矫顽力和矩形比随施镀时间增加而下降。当施镀时间为3min时,Co-Ni-P薄膜矫顽力可达42506.4A/m,矩形比为0.55。X射线衍射及扫描电镜结果表明,随施镀时间增加,薄膜矫顽力下降,晶粒尺寸变大,并发生明显的择优取向。将化学沉积Co-Ni-P薄膜应用于磁旋转编码器的磁鼓记录介质,记录特性测试结果表明,输出信号良好,脉冲计数完整,波形良好,可完整写入2048对磁极。化学沉积Co-Ni-P磁性薄膜适合于高精度、高分辨率的磁旋转编码器的磁鼓记录材料。 相似文献
3.
4.
5.
根据俄歇电子能谱(AES)的深度分布图,得到不同区域的膜厚和在此区域中的元素富集因子与材料性能之间的关系。并以304不锈钢在高温水中生成的氧化膜为例,探讨膜厚和元素铬的富集因子与材料抗应力腐蚀性能之间的关系。 相似文献
6.
7.
8.
研究表明,适当地添加稀土Tb在明显提高Ni50Mn29Ga21合金力学性能的同时,可以保持材料原有的居里温度和饱和磁化强度基本不变.微区成份能谱分析表明,稀土Tb在材料中主要存在于晶界.晶界上的Tb对材料的磁性能没有贡献,同时对晶粒内部Mn原子局域磁矩及其交换作用没有明显的影响. 相似文献
9.
10.
11.
12.
Haibin CHENG Shuai XU Wenyu ZHAO Suling ZHAO Pengcheng ZHAI Zhigang SUN Qingjie ZHANG State Key Laboratory of Advanced Technology for Materials Synthesis Processing Wuhan University of Technology Wuhan China 《材料科学技术学报》2008,24(5):712-714
Electroless CoNiWP magnetic films were prepared by varying the bath pH and then characterized by energy dispersive X-ray analysis, X-ray diffraction and magnetic force microscopy, it has been found that the microstructure and the magnetic properties of films were influenced greatly by the bath pH. At the bath pH 8.06, the grain size and coercivity of the films reach maximuml while the squareness (Mr/Ms) of MH curves reaches minimum. The Henkel plots indicates that the exchange-coupling interaction is very weak at this pH, which may be caused by phase-separation and large grain size, and then results in the lowest squareness. At pH above 8.5, obvious exchange-coupling interaction is observed because of the inexistence of phase-separation and the refinement of grain size. 相似文献
13.
采用化学湿法沉积技术制备了CoNiP磁性薄膜,研究了施镀过程中的诱导磁场对CoNiP薄膜磁性能和结构的影响。研究结果表明,随着施加诱导场强度的增加,CoNiP薄膜的矫顽力先增加,然后减小;当磁场强度为1300 Oe时,薄膜的矫顽力达到了751.7 Oe,比未施加磁场时提高了约28%。X射线衍射结果表明,Co-N-i P薄膜晶粒沿磁场方向生长,其c轴沿薄膜的轴向形成了很强的Co(002)织构。扫描电子显微镜表面形貌观察表明,随着磁场强度的增加,胞状颗粒逐渐增多,晶粒尺寸变小,颗粒之间结合紧密。诱导磁场对CoNiP薄膜的磁性能有良好的促进作用,这为进一步开发高性能的磁电传感器奠定了一定基础。 相似文献
14.
薄膜高频磁阻抗效应及其应用 总被引:2,自引:0,他引:2
本文介绍了Fe-Ni软磁薄膜高频磁阻抗效应及在磁传感技术中的应用,分析了讨论了获得高灵敏度磁传感的途径,磁性薄膜厚度的一般控制在400nm以上抑制Neel壁的出现,为了提高电压输出变化灵敏度,需要沿被测场方向加向Oe的偏磁场并使高频磁场形成闭合回路,感生各向异性通过在溅射薄膜过程中加几百Oe平行于膜的直流磁场获得,与各向异性磁阻效应和巨磁阻效应相比,高频磁阻抗效应传感技术灵敏度高,无巴克豪森噪声, 相似文献
15.
为了获得薄、轻、宽、强等性能理想的吸波材料,采用化学镀的方法在膨胀石墨表面镀覆纳米镍、镍钴、镍铁钴,制备了复合吸波材料.SEM和EDs分析证实,膨胀石墨表面镍层、镍钴层、镍铁钴层的镀覆厚度约为70~150 nm.采用HP8722ES矢量网络分析仪测量了复合吸波材料在2~18 GHz内的复介电常数(ε=ε'-jε")和复磁导率(μ=μ'-jμ").用吸收屏理论公式计算了反射率损耗(R.L)、匹配频段(fm)及匹配厚度(dm).结果表明,当dm=0.3 mm时,镀覆镍铁钴层的复合吸波材料最低的反射损耗达-28 dB,对应的fm=13.5 GHz,R>L<-10 dB时频宽达7.5 GHz.本法制备的复合吸波材料符合"轻、薄、宽、强"的现代要求. 相似文献
16.
17.
Yangkun He Gerhard H. Fecher Chenguang Fu Yu Pan Kaustuv Manna Johannes Kroder Ajay Jha Xiao Wang Zhiwei Hu Stefano Agrestini Javier Herrero-Martín Manuel Valvidares Yurii Skourski Walter Schnelle Plamen Stamenov Horst Borrmann Liu Hao Tjeng Rudolf Schaefer Stuart S. P. Parkin John Michael D. Coey Claudia Felser 《Advanced materials (Deerfield Beach, Fla.)》2020,32(45):2004331
The development of high-density magnetic recording media is limited by superparamagnetism in very small ferromagnetic crystals. Hard magnetic materials with strong perpendicular anisotropy offer stability and high recording density. To overcome the difficulty of writing media with a large coercivity, heat-assisted magnetic recording was developed, rapidly heating the media to the Curie temperature Tc before writing, followed by rapid cooling. Requirements are a suitable Tc, coupled with anisotropic thermal conductivity and hard magnetic properties. Here, Rh2CoSb is introduced as a new hard magnet with potential for thin-film magnetic recording. A magnetocrystalline anisotropy of 3.6 MJ m−3 is combined with a saturation magnetization of μ0Ms = 0.52 T at 2 K (2.2 MJ m−3 and 0.44 T at room temperature). The magnetic hardness parameter of 3.7 at room temperature is the highest observed for any rare-earth-free hard magnet. The anisotropy is related to an unquenched orbital moment of 0.42 μB on Co, which is hybridized with neighboring Rh atoms with a large spin–orbit interaction. Moreover, the pronounced temperature dependence of the anisotropy that follows from its Tc of 450 K, together with a thermal conductivity of 20 W m−1 K−1, make Rh2CoSb a candidate for the development of heat-assisted writing with a recording density in excess of 10 Tb in.−2. 相似文献