GROWTH MODE EVOLUTION AND SUBSEQUENT MAGNETIC PROPERTIES OF Fe FILMS WITH DIFFERENT GRAIN SIZES UNDER A HIGH MAGNETIC FIELD

作者：Du Jiaojiao; Li Guojian^*; Wang Qiang; Ma Yonghui; Wang Huimin; Li Mengmeng

来源：Acta Metallurgica Sinica, 2015, 51(7): 799-806.

• high magnetic field
• Fe film
• nanocrystalline
• columnar growth
• magnetic properties

In order to increase the magnetic properties and realize the essential applications in magnetic recording and spintronics devices, it is significant to control the growth mode and grain size of Fe films. In this work, the effects of a high magnetic field (HMF) on the growth and magnetic properties of Fe thin films with different grain sizes by using physics vapor deposition were explored. The decreased grain sizes are obtained by increasing the evaporation source temperatures. It is found that when the evaporation source temperature is 1440 degrees C, the grains of film are fine. The growth mode is changed from layered to columnar by HMF. And HMF effectively reduces the defects of Fe film. When the evaporation source temperature is 1400 and 1350 degrees C, the grains of films are large. HMF does not change the columnar growth mode of films. However, the width of columns is improved by a HMF. Additionally, HMF increases the average particle (composed of the grains) and grain size of Fe films with different grain sizes. And the surface roughness of all the films is remarkably reduced by a HMF. With the decrease of grain sizes, the ability of HMF on increasing the coercivity, saturation magnetization and squareness ratio of the Fe films is enhanced.

• 出版日期2015-7-11
• 单位东北大学