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Heavy Ion Irradiated Ferromagnetic Films: The Cases of Cobalt and Iron

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Abstract

Polycrystalline, e-gun deposited Co, Fe and Co/Fe films, tens of nanometers thick, have been irradiated with Ne, Kr, Xe and/or Fe ions to fluences of up to 5 × 1016 ions/cm2. Changes in the magnetic texture induced by the implanted ions have been measured by means of hyperfine methods, such as Magnetic Orientation Mössbauer Spectroscopy (Fe), and by Magneto-Optical Kerr Effect and Vibrating Sample Magnetometry. In Co and CoFe an hcp → fcc phase transition has been observed under the influence of Xe-ion implantation. For 1016 Xe-ions/cm2, ion beam mixing in the Co/Fe system produces a soft magnetic material with uniaxial anisotropy. The effects have been correlated with changes in the microstructure as determined via X-ray diffraction. The influences of internal and external strain fields, an external magnetic field and pre-magnetization have been studied. A comprehensive understanding of the various effects and underlying physical reasons for the modifications appears to emerge from these investigations.

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Author notes

  1. R. Gupta

    Present address: Institute of Instrumentation, Devi Ahilya University, Indore, 452017, India

Authors and Affiliations

  1. II. Physikalisches Institut and SFB 602, Universität Göttingen, Tammannstr. 1, D-37077, Göttingen, Germany

    K. P. Lieb, K. Zhang, G. A. MÜller, R. Gupta & P. Schaaf

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  1. K. P. Lieb
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  2. K. Zhang
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  3. G. A. MÜller
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  4. R. Gupta
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  5. P. Schaaf
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Correspondence to K. P. Lieb.

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Lieb, K.P., Zhang, K., MÜller, G.A. et al. Heavy Ion Irradiated Ferromagnetic Films: The Cases of Cobalt and Iron. Hyperfine Interact 160, 39–56 (2005). https://doi.org/10.1007/s10751-005-9148-6

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