title: Nanometer Scale Hard/Soft Bilayer Magnetic Antidots.
abstract: The effect of arrays of nanometer scale pores on the magnetic properties of thin films has been analyzed. Particularly, we investigated the influence of the out-of-plane magnetization component created by the nanopores on the in-plane magnetic behavior of patterned hard/soft magnetic thin films in antidot morphology. Its influence on the coupling in Co/Py bilayers of few tens of nanometer thick is compared for disordered and ordered antidots of 35-nm diameter. The combination of magneto-optical Kerr effect (MOKE) and first-order reversal curve (FORC) technique allows probing the effects of the induced perpendicular magnetization component on the bilayer magnetic behavior, while magnetic force microscopy (MFM) is used to image it. We found that ordered antidots yield a stronger out-of-plane component than disordered ones, influencing in a similar manner the hard layer global in-plane magnetic behavior if with a thin or without soft layer. However, its influence changes with a thicker soft layer, which may be an indication of a weaker coupling.
authors.affiliation: Instituto de Física Gleb Wataghin (IFGW), Universidade Estadual de Campinas (UNICAMP), Campinas, SP, 13083-859, Brazil. fberon@ifi.unicamp.br.
authors.forename: Fanny
authors.identifier: http://orcid.org/0000-0002-4926-2963
authors.initials: F
authors.lastname: Béron
authors.affiliation: Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", Aghia Paraskevi, Attiki, Athens, 15310, Greece. a.kaidatzis@inn.demokritos.gr.
authors.forename: Andreas
authors.initials: A
authors.lastname: Kaidatzis
authors.affiliation: Instituto de Física Gleb Wataghin (IFGW), Universidade Estadual de Campinas (UNICAMP), Campinas, SP, 13083-859, Brazil. manduri@ifi.unicamp.br.
authors.forename: Murilo F
authors.initials: MF
authors.lastname: Velo
authors.affiliation: Instituto de Física Gleb Wataghin (IFGW), Universidade Estadual de Campinas (UNICAMP), Campinas, SP, 13083-859, Brazil. lcca@ifi.unicamp.br.
authors.forename: Luis C C
authors.initials: LC
authors.lastname: Arzuza
authors.affiliation: Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC), Madrid, 28049, Spain. epalmero@icmm.csic.es.
authors.forename: Ester M
authors.initials: EM
authors.lastname: Palmero
authors.affiliation: Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC), Madrid, 28049, Spain. rafael.perez@icmm.csic.es.
authors.forename: Rafael P
authors.initials: RP
authors.lastname: Del Real
authors.affiliation: Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", Aghia Paraskevi, Attiki, Athens, 15310, Greece. d.niarchos@inn.demokritos.gr.
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Niarchos
authors.affiliation: Instituto de Física Gleb Wataghin (IFGW), Universidade Estadual de Campinas (UNICAMP), Campinas, SP, 13083-859, Brazil. krpirota@ifi.unicamp.br.
authors.forename: Kleber R
authors.initials: KR
authors.lastname: Pirota
authors.affiliation: IMM-Instituto de Microelectrónica de Madrid (CNM-CSIC), 28760, Tres Cantos, Madrid, Spain. jmiguel@imm.cnm.csic.es.
authors.forename: José Miguel
authors.initials: JM
authors.lastname: García-Martín
keywords: Exchange-spring magnets; First-order reversal curve (FORC); Magnetic antidot arrays; Magneto-optical Kerr effect (MOKE); Structured magnetic thin films