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Higher ferromagnetic resonance frequency in NiFe/FeMn film obtained by flash annealing in reversing field

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Abstract

The unsaturated magnetization reversal by pulsed current annealing was investigated in exchange biased NiFe(15 nm)/FeMn(10 nm) bilayer. The magnetization reversal was conducted by energizing and thus heating the film under an external applied magnetic field (\(H_{\text{a}}\)) with the direction opposite to the deposition field (\(H_{\text{d}}\)). The static and dynamic magnetic properties of the films before and after rapid annealing were characterized using vibrating sample magnetometer, anisotropic magnetoresistance (AMR) and vector network analyzer measurements. When the samples were annealed at 40 and 45 V condenser voltages, greater values of rotational anisotropy \((H_{\text{rot}} )\), ferromagnetic resonance frequency (\(f_{\text{r}}\)) and smaller values of exchange bias field \((H_{\text{e}} )\), exchange bias field in AMR measurement (\(H_{\text{e}}^{\text{MR}}\)), and magnetoresistance in the samples were obtained, which is attributed to the unsaturated reversed magnetization in reversing magnetic field. A suggested model for which the scattered magnetization of magnetic moment results in additional unstable antiferromagnetic spins in the film was proposed to explain this interesting phenomenon.

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Acknowledgements

We thank the Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education for carrying out the Vector Network Analyzer measurements. This work was supported by Young Science and Technology Innovation Team of Sichuan Province (No. 2017TD0020) and the Sichuan Science and Technology Program of China (No. 2018SZ0282).

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Authors and Affiliations

  1. State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology, Mianyang, 621010, China

    Zhen Wang, Bo Dai, Yong Ren & Shijie Tan

  2. 9th Institute of China Electronics Technology Group Corporation, Mianyang, 621000, China

    Shijie Tan, Jing Ni & Jun Li

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  1. Zhen Wang
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  2. Bo Dai
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  3. Yong Ren
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  4. Shijie Tan
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Correspondence to Bo Dai.

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Wang, Z., Dai, B., Ren, Y. et al. Higher ferromagnetic resonance frequency in NiFe/FeMn film obtained by flash annealing in reversing field. J Mater Sci: Mater Electron 30, 18328–18335 (2019). https://doi.org/10.1007/s10854-019-02186-z

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  • DOI: https://doi.org/10.1007/s10854-019-02186-z

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