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

doi:10.11900/0412.1961.2015.00084

Acta Metall Sin

2015, Vol. 51

Issue (7): 799-806 DOI: 10.11900/0412.1961.2015.00084

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

Jiaojiao DU,Guojian LI(

),Qiang WANG,Yonghui MA,Huimin WANG,Mengmeng LI

Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110819

Cite this article:

Jiaojiao DU,Guojian LI,Qiang WANG,Yonghui MA,Huimin WANG,Mengmeng LI. GROWTH MODE EVOLUTION AND SUBSEQUENT MAGNETIC PROPERTIES OF Fe FILMS WITH DIFFERENT GRAIN SIZES UNDER A HIGH MAGNETIC FIELD. Acta Metall Sin, 2015, 51(7): 799-806.

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Abstract

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 ℃, 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 ℃, 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.

Key words: high magnetic field Fe film nanocrystalline columnar growth magnetic properties

Fund: Supported by National Natural Science Foundation of China (Nos.51101034 and 51425401), Fundamental Research Funds for the Central Universities (Nos.N130509002 and N140902001) and General Project of Science and Technology Education Department of Liaoning Province (No.L2014091)

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	Jiaojiao DU
	Guojian LI
	Qiang WANG
	Yonghui MA
	Huimin WANG
	Mengmeng LI

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00084 OR https://www.ams.org.cn/EN/Y2015/V51/I7/799

Fig.1 XRD patterns of Fe films under different conditions

Fig.2 Growth rate of Fe films prepared without high magnetic field and the grain sizes of Fe films under different conditions

Fig.3 Cross sectional TEM images of Fe films fabricated under different conditions (The width of columns was shown in Figs.3a2, b2, c2, d2 and f2. The diameter of grains was presented in Fig.3e2)

(a1, a2) 1350 ℃/0 T (b1, b2) 1350 ℃/6 T (c1, c2) 1400 ℃/0 T

(d1, d2) 1400 ℃/6 T (e1, e2) 1440 ℃/0 T (f1, f2) 1440 ℃/6 T

Fig.4 SEM images of the Fe films under different conditions

(a) 1350 ℃/0 T (b) 1350 ℃/6 T (c) 1400 ℃/0 T (d) 1400 ℃/6 T (e) 1440 ℃/0 T (f) 1440 ℃/6 T

Fig.5 AFM images and line section analysis of the Fe films under different conditions

(a) 1350 ℃/0 T (b) 1350 ℃/6 T (c) 1400 ℃/0 T

(d) 1400 ℃/6 T (e) 1440 ℃/0 T (f) 1440 ℃/6 T

Fig.6 Magnetic hysteresis (M-H) loops measured at room temperature by applying the magnetic fields perpendicular (a) and parallel (b) to the surface of Fe films under different conditions (M—magnetization, M_s—saturation magnetization, H_//—applied field parallel to the film plane, H_⊥—applied field perpendicular to the film plane)

Fig.7 Value of magnetic properties of Fe films under different conditions when the applied field is parallel to the film surface

(a) saturation magnetization (M_s) and coercivity (H_c)

(b) remanence ratio (M_r/M_s) and strain ( e) (M_r—remanent magnetization)

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