节点文献

混合磁性薄膜矫顽力及阶梯效应的微磁学及Monte Carlo研究

Study on the coercivity and step effect of mixed magnetic films by micromagnetism and Monte Carlo simulation

  • 推荐 CAJ下载
  • PDF下载
  • 不支持迅雷等下载工具,请取消加速工具后下载。

【作者】 翁臻臻冯倩黄志高都有为

【Author】 Weng Zhen_Zhen 1) Feng Qian 1) Huang Zhi Gao 1)2) Du You Wei 2) 1) (School of Physics and Optoelectronics Technology, Fujian Normal University, Fuzhou\ 350007,China) 2) (National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093,China)

【机构】 福建师范大学物理与光电信息科技学院,福建师范大学物理与光电信息科技学院,福建师范大学物理与光电信息科技学院,南京大学固体微结构国家重点实验室 福州350007,福州350007,福州350007南京大学固体微结构国家重点实验室,南京210093,南京210093

【摘要】 采用能量极小原理的微磁学及MonteCarlo方法对铁磁 反铁磁混合磁性薄膜的磁特性进行了模拟计算 ,研究了基态下系统的磁滞回线、自旋组态及铁磁交换作用常数JAA、单轴各向异性常数K、偶极相互作用常数D和铁磁性原子掺杂量X对矫顽力Hc 的影响 .同时还模拟计算了矫顽力Hc 的温度特性 .模拟结果表明 ,在混合磁性薄膜中磁滞回线存在明显的阶梯效应 ,利用简单的Ising模型揭示这种阶梯效应主要起源于包含不同反铁磁原子的掺杂量的不同尺寸的原子团对外加磁场所产生不同响应 ;在基态下当 0 5≤X≤ 1 0时矫顽力Hc 随K ,JAA 的增大而增大 ,但随D增大而减小 ;Hc 随X的变化存在极大值 .这些结果很好地解释了具有反铁磁耦合的颗粒膜的实验事实 .不同X下矫顽力随温度的变化规律可以用Tα 律很好地描述 ,但α值随X却有复杂的变化

【Abstract】 The magnetic properties of ferromagnetically and antiferromagnetically mixed films are simulated by micromagnetism method based on the principle of energy minimum and Monte Carlo technology. The hysteresis loops, spin configurations, and the influences of exchange constant J AA , uniaxial anisotropy constant K , dipolar interaction constant D and diluted ratio of ferromagnetic atom X on the coercivity H c at the ground states are studied systematically for the systems studied. At the same time, the temperature dependence of the coercivity is calculated. The simulated results indicate that: (1) a step like hysteresis is evidently observed in the mixed magnetic films, and the result calculated by a simple Ising model reveals that the step like effect can be attributed to the different response of the clusters with different size and different diluted ratio of antiferromagnetic atom on the external field; (2) at the ground states, as 0 5≤ X ≤1 0, the value of H c increases with increasing values of K, J AA , but decreases with increasing value of D ; (3) a peak exists in the H c X curves. These simulated results explain the experimental facts about the granular films with antiferromagnetic coupling. The T dependence of the value of H c for the films with different magnitude of X can be well described by the law of T α . But the value of α has a complex variation with the change of X .

【基金】 教育部高等学校骨干教师资助计划 ;福建省自然科学基金重点项目 (批准号 :E0 3 2 0 0 0 2 );国家 973项目 (批准号 :19990 64 5 0 8)资助的课题~~
  • 【文献出处】 物理学报 ,Acta Physica Sinica , 编辑部邮箱 ,2004年09期
  • 【分类号】O484
  • 【被引频次】19
  • 【下载频次】217
节点文献中: 

本文链接的文献网络图示:

本文的引文网络