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Anomalous Magnetization Behavior of Fe-N Films Deposited by Reactive Pulsed Laser Deposition

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5 Author(s)
Jing Li ; Dept. of Mater. Sci. & Eng., Zhejiang Univ., Hangzhou, China ; Yinzhu Jiang ; Tianyu Ma ; Yang, D.
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A series of Fe-N films with thickness of 200 nm have been prepared by reactive pulsed laser deposition (PLD) at 25°C and at 150°C in various nitrogen pressures. Both series of samples consist of mixtures of γ'-Fe 4N and α-Fe phase. The amount of α-Fe decreases with the increase of nitrogen pressure. Higher remnant ratio and lower coercivity are observed for the films deposited at 150°C compared to the films deposited at 25°C. An anomalously large magnetization is observed for both series of films deposited at a nitrogen pressure of 8 mTorr. The average magnetization is as high as or even larger than that of α-Fe. Conversion electron Mössbauer spectroscopy demonstrated that the highest-magnetization film consists mixtures of γ'-Fe4N and α-Fe phase at a mole ratio of 1:6. The origin of this intriguing high moment is ascribed to a certain lattice constant of the α-Fe which is in a heterogeneous state with γ'-Fe4N for films deposited at a certain nitrogen pressure.

Published in:

Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 11 )

Date of Publication:

Nov. 2012

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