Research Paper

Journal of Nanoparticle Research

, Volume 13, Issue 1, pp 245-255

First online:

Morphology and magnetic properties of island-like Co and Ni films obtained by de-wetting

  • P. TibertoAffiliated withElectromagnetism Division, INRIM
  • , S. GuptaAffiliated withPolitecnico di Torino, DISMIC and DIFIS
  • , S. BiancoAffiliated withItalian Institute of Technology—IIT@POLITO, Center for Space Human Robotics
  • , F. CelegatoAffiliated withElectromagnetism Division, INRIM
  • , P. MartinoAffiliated withPolitecnico di Torino, DISMIC and DIFIS
  • , A. ChiolerioAffiliated withPolitecnico di Torino, DISMIC and DIFIS
  • , A. TagliaferroAffiliated withPolitecnico di Torino, DISMIC and DIFIS
  • , P. AlliaAffiliated withPolitecnico di Torino, DISMIC and DIFIS Email author 

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The morphological, structural, and magnetic properties of Co and Ni films of different thicknesses grown by RF sputtering on a Si–SiO substrate and submitted to controlled diffusion of atoms on the substrate (de-wetting) are studied through X-ray diffraction (XRD), atomic force microscopy, X-ray photoelectron spectroscopy, and alternating-gradient magnetometry. For both metals, de-wetting treatment leads to the growth of non-percolating, metallic nanoislands characterized by a distribution of sizes and aspect ratios. XRD spectra reveal a polycrystalline multi-component structure evolving by effect of de-wetting and directly affecting the magnetic properties of films. The magnetic response after de-wetting is consistent with the formation of a nanogranular magnetic phase characterized by a complex, thickness-dependent magnetic behavior originating from the simultaneous presence of superparamagnetic and blocked-particle contributions. At intermediate film thickness (around 10 nm), a notable enhancement in magnetic coercivity is observed for both metals with respect to the values measured in precursor films and in their bulk counterparts.


Magnetic nanoparticles Magnetic thin films De-wetting technique Coercive field