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The effect of temperature and film thickness on domain wall energy density, coercivity force and magnetostriction of galfenol films

Lookup NU author(s): Dr Barry Gallacher, Dr Sarah Olsen

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Abstract

IEEEGalfenol thin film exhibits a promising future for applications in MEMs, switches and sensing because of its notable magnetostriction property and favorable soft dynamic behavior. Here, we report an investigation into the alterations in surface islands and magnetic domain structure of galfenol thin film using Atomic force microscopy (AFM) and Magnetic force microscopy (MFM) following a heating and cooling process. A MATLAB based stereological method was employed to calculate the domain width (D_w) and domain wall energy density (γ_w) of galfenol thin film. We found an increase in domain width and decrease in domain wall energy density, as well as variations in the effectiveness of magnetostriction (λ_s) and coercivity force (H_c) with increasing temperature. The influence of film thickness on magnetostriction and coercivity force were investigated as well.

Publication metadata

Author(s): Tang Y, Fan S, Gallacher B, Wang Y, Olsen S

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Magnetics

Year: 2024

Pages: epub ahead of print

Online publication date: 09/04/2024

Acceptance date: 02/04/2024

ISSN (print): 0018-9464

ISSN (electronic): 1941-0069

Publisher: Institute of Electrical and Electronics Engineers Inc.

URL: https://doi.org/10.1109/TMAG.2024.3386764

DOI: 10.1109/TMAG.2024.3386764

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