title: Size-Specific Spin Configurations in Single Iron Nanomagnet: From Flower to Exotic Vortices.
abstract: The different spin configurations in the vicinity of the single-domain/vortex transition are reported in isolated magnetic nanoparticles. By combining chemical synthesis, electron holography in a dedicated transmission electron microscope and micromagnetic simulations, we establish the "magnetic configurations vs size" phase diagram of Fe single-crystalline nanocubes. Room temperature high resolution magnetic maps reveal the transition between single-domain and vortex states for Fe nanocubes from 25 to 27 nm, respectively. An intermediate spin configuration consisting of an ⟨111⟩ vortex is for the first time evidenced.
authors.affiliation: Centre d'Elaboration de Matériaux et d'Etudes Structurales, CEMES-CNRS , 29 rue Jeanne Marvig, B.P. 94347, 31055 Toulouse, France.
authors.forename: Christophe
authors.initials: C
authors.lastname: Gatel
authors.affiliation: Laboratoire de Physique et Chimie des Nano-Objets, LPCNO, UMR5215 INSA-UPS-CNRS, Université de Toulouse; Institut National des Sciences Appliquées , 135 avenue de Rangueil, 31077 Toulouse, France.
authors.forename: Francisco Javier
authors.initials: FJ
authors.lastname: Bonilla
authors.affiliation: Laboratoire de Physique et Chimie des Nano-Objets, LPCNO, UMR5215 INSA-UPS-CNRS, Université de Toulouse; Institut National des Sciences Appliquées , 135 avenue de Rangueil, 31077 Toulouse, France.
authors.forename: Anca
authors.initials: A
authors.lastname: Meffre
authors.affiliation: Centre d'Elaboration de Matériaux et d'Etudes Structurales, CEMES-CNRS , 29 rue Jeanne Marvig, B.P. 94347, 31055 Toulouse, France.
authors.forename: Etienne
authors.initials: E
authors.lastname: Snoeck
authors.affiliation: Centre d'Elaboration de Matériaux et d'Etudes Structurales, CEMES-CNRS , 29 rue Jeanne Marvig, B.P. 94347, 31055 Toulouse, France.
authors.forename: Bénédicte
authors.initials: B
authors.lastname: Warot-Fonrose
authors.affiliation: Laboratoire de Physique et Chimie des Nano-Objets, LPCNO, UMR5215 INSA-UPS-CNRS, Université de Toulouse; Institut National des Sciences Appliquées , 135 avenue de Rangueil, 31077 Toulouse, France.
authors.forename: Bruno
authors.initials: B
authors.lastname: Chaudret
authors.affiliation: Laboratoire de Physique et Chimie des Nano-Objets, LPCNO, UMR5215 INSA-UPS-CNRS, Université de Toulouse; Institut National des Sciences Appliquées , 135 avenue de Rangueil, 31077 Toulouse, France.
authors.forename: Lise-Marie
authors.initials: LM
authors.lastname: Lacroix
authors.affiliation: Laboratoire de Physique et Chimie des Nano-Objets, LPCNO, UMR5215 INSA-UPS-CNRS, Université de Toulouse; Institut National des Sciences Appliquées , 135 avenue de Rangueil, 31077 Toulouse, France.
authors.forename: Thomas
authors.initials: T
authors.lastname: Blon
keywords: electron holography; flower state; magnetic configuration; nanocube; single domain state; vortex state