{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,16]],"date-time":"2026-03-16T13:50:37Z","timestamp":1773669037431,"version":"3.50.1"},"reference-count":47,"publisher":"AIP Publishing","issue":"12","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2012,6,15]]},"abstract":"<jats:p>Magnetic properties of nano-granular Co0.55\u2013(Al2O3)0.45 films have been studied by vibrating sample magnetometry, ferromagnetic resonance, and magnetic force microscopy (MFM). The films possess a growth-induced perpendicular anisotropy related to the shape anisotropy of the granules. Being unpercolated physically, the films demonstrated a clear magnetic percolation behavior in the temperature dependence of the coercivity and MFM scans. The temperature dependence of the coercivity measured along the easy magnetization axis of the granules indicates the presence of a collective long-range magnetic state sustained by a ferromagnetic interparticle interaction. This interaction is supposed to form a homogeneously magnetized superferromagnetic state, however, the perpendicular anisotropy and the competition between the dipole-dipole and ferromagnetic interactions lead to the emergence of an inhomogeneous labyrinth-like magnetic stripe-domain structure with the averaged domain width being about two orders of magnitude larger than the averaged granule size. The temperature evolution of the spontaneous magnetization inside the stripe domains has been measured by the MFM up to the temperature of superferromagnetic ordering (420\u2009K). The formerly developed mean-field-based model of the coercivity of an interacted ensemble has been tested and found to yield adequate quantitative predictions.<\/jats:p>","DOI":"10.1063\/1.4730397","type":"journal-article","created":{"date-parts":[[2012,6,28]],"date-time":"2012-06-28T14:42:34Z","timestamp":1340894554000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":34,"title":["Superferromagnetism and coercivity in Co-Al2O3 granular films with perpendicular anisotropy"],"prefix":"10.1063","volume":"111","author":[{"given":"A. A.","family":"Timopheev","sequence":"first","affiliation":[{"name":"Department of Physics & I3N, University of Aveiro, Campus Universit\u00e1rio de Santiago 1 , 3810-193 Aveiro, Portugal"},{"name":"Institute of Physics, National Academy of Sciences of Ukraine 2 , pr. Nauki 46, Kiev 03028, Ukraine"}]},{"given":"I.","family":"Bdikin","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, TEMA, University of Aveiro 3 , 3810-193 Aveiro, Portugal"}]},{"given":"A. F.","family":"Lozenko","sequence":"additional","affiliation":[{"name":"Institute of Physics, National Academy of Sciences of Ukraine 2 , pr. Nauki 46, Kiev 03028, Ukraine"}]},{"given":"O. V.","family":"Stognei","sequence":"additional","affiliation":[{"name":"Voronezh State Technical University 4 , Moskovskii pr. 14, Voronezh 394026, Russia"}]},{"given":"A. V.","family":"Sitnikov","sequence":"additional","affiliation":[{"name":"Voronezh State Technical University 4 , Moskovskii pr. 14, Voronezh 394026, Russia"}]},{"given":"A. V.","family":"Los","sequence":"additional","affiliation":[{"name":"Freescale Semiconductor Ukraine LLC 5 , 15 Bozhenko Street, Kiev 03680, Ukraine"}]},{"given":"N. 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