Development of flexible Ni80Fe20 magnetic nano-thin films

Melvin Vopson, John Naylor, Treetep Saengow, Edith Grace Rogers, Serban Lepadatu, Yuri Fetisov

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    Flexible magnetic Ni80Fe20 thin films with excellent adhesion, mechanical and magnetic properties have been fabricated using magnetron plasma deposition. We demonstrate that flexible Ni80Fe20 thin films maintain their non-flexible magnetic properties when the films are over 60 nm thick. However, when their thickness is reduced, the flexible thin films display significant increase in their magnetic coercive field compared to identical films coated on a solid Silicon substrate. For a 15 nm flexible Ni80Fe20 film coated onto 110 μm Polyvinylidene fluoride polymer substrate, we achieved a remarkable 355% increase in the magnetic coercive field relative to the same film deposited onto a Si substrate. Experimental evidence, backed by micro-magnetic modelling, indicates that the increase in the coercive fields is related to the larger roughness texture of the flexible substrates. This effect essentially transforms soft Ni80Fe20 permalloy thin films into medium/hard magnetic films allowing not only mechanical flexibility of the structure, but also fine tuning of their magnetic properties.
    Original languageEnglish
    Pages (from-to)12-15
    Number of pages4
    JournalPhysica B: Condensed Matter
    Early online date4 Sept 2017
    Publication statusPublished - 15 Nov 2017


    • Plasma sputtering
    • Magnetic hysteresis
    • Flexible thin films
    • NiFe
    • Substrate roughness effects


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