Nanoscale physical microstructure and micromagnetic behaviour of CoIr film with negative anisotropy

D. T. Ngo, A. Hashimoto, S. McVitie, S. Saito, J. N. Chapman, M. Takahashi

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The physical and magnetic structure of hcp-CoIr(10 nm)/Ru(5 nm) has been systematically characterized using transmission electron microscopy. The film was observed to be polycrystalline with a mean grain size of 15.7 ± 1.1 nm. Additionally, diffraction analysis in the TEM confirmed the presence of a [0 0 0 1] texture normal to the film plane resulting from a Ru seed layer. Lorentz microscopy observation with in situ magnetizing experiments showed that the film possessed a weak-anisotropy easy axis with considerable dispersion of magnetic ripple and domain wall nucleation over a negative field of 25 Oe. Magnetization reversal on the hard axis shows a non-coherent rotation of magnetic moments from easy axis to hard axis denoted by a non-uniform nucleation of low-angle walls. Dispersion of magnetization ripple is in agreement with classical ripple theory. Generally the magnetization reversal was complete by 30 Oe; however, some small regions remained which were not fully reversed with associated 360° domain walls. These appeared to be strongly pinned locally and required much larger fields to eliminate them.

Original languageEnglish
Article number095001
JournalJournal Physics D: Applied Physics
Issue number9
Publication statusPublished - 2011 Mar 9


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