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(σs) and coercivity values(Hc) of the nickel nanorods are 50.649 A·m2/kg and 190.0×(103/4π)A/m,respectively. Finally, a possible mechanism for the formation of nickel nanorods was discussed briefly. Key words: nickel hydroxide nanorods; nickel nanorods; PVP(polyvinylpyrrolidone); PEG(polyethylene glycol); specific saturation magnetization; coercivity 1 Introduction Since 1991......
hysteresis with external magnetic field at room temperature, and their saturation magnetization and remanent magnetization increase with the increase of grain size, while their coercivity and remanence ratio firstly increase to the maximum and then decrease. The sample calcined at 800 ℃ for 10 h has the strongest magnetic properties, possesses a wider hysteresis loop, higher coercivity and remanence......
文献标识码:A Microstructure and coercivity mechanism of Sm2Co17 type high temperature rare-earth permanent magnets LI Li-ya, YI Jian-hong, GE Yi-cheng, PENG Yuan-dong...?5 phase transform to 2?7 phase,and the coercivity mechanism changes to pinning at the 1?5 phase and nucleation at the 2?7 phase. With increasing the temperature higher than the Curie temperature......
-Mn alloy can be prepared by ball milling for 30 h. The measurement of magnetization indicates that the coercivity HC of Cr72Fe18Mn10 powder increases with increasing the milling time and it reaches... interaction is different during the milling process. Key words: Cr72Fe18Mn10 powder; mechanical alloying; coercivity; ferromagnet-antiferromagnet exchange interaction 纯Cr在室温时是一种非公度的自旋密度波(SDW)反铁磁金属. 当掺入铁磁性杂质......
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of Materials and Chemical Engineering, Ningbo University of Technology摘 要:Isotropic Sm-Co nanoparticle powders with high coercivity were prepared by high-energy ball milling followed by optimal annealing at different temperatures. The covercivity increased monotonically with increasing of the annealing temperature and a highest coercivity of 31.2 kOe was obtained......
混合合金法添加DyH_x对烧结Nd-Fe-B磁体性能和微观结构的影响 赵睿1,张文臣1,刘国军1,李家节1,李卫1 (1.钢铁研究总院,功能材料研究所,北京,100081) 摘要:以Nd_(31.5)Fe_(bal)B_(6.0)Co_(1.2)Cu_(0.04)(质量分数,%)为母合金,添加不同含量DyH_x粉研究Dy对Nd-Fe-B磁体性能和微观结构的影响.研究发现,Dy未扩散到主相晶粒中,主要分布在晶界相中;Dy使磁体晶粒得到细化,均匀化,异常长大晶粒基本消失,晶粒边界结构得到改善;添加0.5%(质量分数)的DyH_x粉可以明显提高磁体矫顽力H_(cj),但添加量超过1.0%(质量分数),磁体矫顽力H_(cj)增幅变小,磁体密度严重下降. 关键词:晶粒尺寸; 矫顽力; 晶界相; 形核场; grain size; coercivity; intergranular phase......
ferrite; coercivity; [全文内容正在添加中] ......
铁磁/反铁磁双层膜中的磁化性质与界面微结构 王茂华1,胡经国1,许小勇1 (1.扬州大学物理科学与技术学院,扬州,225002) 摘要:采用Monte Carlo模拟方法,通过反铁磁层中非磁性掺杂方式调节铁磁层与反铁磁层界面微结构,讨论了其界面微结构对体系的磁滞回线的不对称性,交换偏置场及矫顽场的影响.模拟结果显示:在同一掺杂浓度下,体系的磁滞回线的不对称性及交换偏置场强烈地依赖于掺杂方式,但矫顽场几乎不受影响,其相应的温度特性亦依赖于掺杂方式.它表明铁磁/反铁磁双层膜体系中的磁滞回线的不对称性以及交换偏置场与其界面微结构密切相关,同时实验上人们可通过界面微结构的改变获得交换偏置场大,矫顽场小且热稳定性好的自旋阀结构. 关键词:铁磁/反铁磁双层膜; 交换偏置场; 矫顽场; 磁畴结构; FM/AFM bilayers; exchange-bias field; coercivity......
的矫顽力要高,这是由于前者比后者具有更均匀的微结构造成的.非晶薄带晶化后矫顽力最大为1616 kA/m,高的矫顽力与添加Pr和Nb有关. 关键词:辊速; 晶化; 矫顽力; 富稀土合金; wheel velocity; crystallization; coercivity; rich-rare earth alloys; [全文内容正在添加中] ......