摘要本文主要研究了不同反铁磁层厚度、不同MgO掺杂浓度对FeCo/IrMn体系的各向异性调控和机制。利用了磁控溅射设备制备样品，而后利用振动样品磁强计(VSM)、能谱仪(EDS)、扫描电子显微镜(SEM)对薄膜进行了静态磁性能、表面形貌及物相成分的表征。

研究发现，在FeCo/IrMn体系中，随着反铁磁层厚度从增大到，交换偏置场也增大，各向异性场增大。与此同时，铁磁层的层间作用减弱，磁滞回线出现台阶。各向异性场主要与交换偏置场有关。两者关系是线性的；随着反铁磁层中MgO的含量增大，稀释作用加强，交换偏置场先增大，在MgO掺杂x=0。019的时候达到极大值249Oe，而后逐渐下降，最后趋于170Oe。并且矫顽力在x=0。019的时候突然下降。总各向异性场的随MgO含量增加的变化趋势与交换偏置场的相似。因此FeCo/IrMn体系的各向异性主要与反铁磁层厚度和MgO掺杂量有关。各向异性可以通过改变反铁磁层厚度和MgO掺杂量来调控。87782

毕业论文关键词  磁控溅射 磁各向异性 交换偏置 稀释反铁磁

毕业设计说明书外文摘要

Title  The Adjustment and Mechanism of Magnetic Anisotropy in     Exchange Bias Multilayers Based on Dilution Antiferromagnet Effect

Abstract

This paper studied the adjustment and principle of anisotropy on FeCo/IrMn system by changing the thickness of AFM and the proportion of MgO。 Magnetron sputtering was for samples preparation。 Vibrating sample magnetometer (VSM), energy dispersive spectroscopy (EDS), scanning electron microscopy (SEM)。 were used to characterize the films component that static magnetic properties, surface morphology and physical phase。

The study found that the exchange bias field（HEB）and the asisotropy（HK）would be enhanced with the increase thickness of AFM layer。 In the mean while,due to the weakened effect between FM layers，steps showed in the hysteresis loop。 HK was mainly related to HEB。They are linear dependence; On the other hand,when the MgO proportion increased, the nonmagnetic dilution effect enhanced and HEB increased。When x=0。019,HEB reached maximum 249Oe, and then decreased。 At the last stage,it was closed to 170Oe。The coercivity sharply decreased  when x=0。019。 The functional relationship between HK and MgO proportion was similar to the HEB situation。 In conclusion,for FeCo/IrMn system,HK is mainly related to the thickness of AFM and the proportion of MgO。It can be adjusted by changing thickness of AFM and proportion。

Keywords: Magnetron sputtering; magnetic Anisotropy; Exchange bias；Dilution Antiferromagnet

 目   次

1  引言 1

1。1  课题背景 1

1。2  铁磁/反铁磁交换偏置的简介与特征 1

1。3  交换偏置中反铁磁稀释效应的研究 5

1。4  磁各向异性分类 5From+优`尔^文W网wWw.YouErw.com 加QQ75201^8766

1。5  选题目的以及研究内容 7

2  实验过程和方法 8

2。1  实验样品的制备与设计 8

2。2  磁控溅射技术 9

2。3  振动样品磁强计（VSM） 10

2。4  扫描电子显微镜（SEM）和能谱仪（EDS） 11

3  薄膜样品磁性能分析 11

3。1  前期工作