Size-Specific Spin Configurations in Single Iron Nanomagnet: From Flower to Exotic Vortices

Gatel, Christophe; Bonilla, Francisco; Meffre, Anca; Snoeck, E.; Warot-Fonrose, Bénédicte; Chaudret, Bruno; Lacroix, Lise‐Marie; Blon, Thomas

doi:10.1021/acs.nanolett.5b02892

Cited by 68 publications

(76 citation statements)

References 31 publications

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“…In contrast with the previous experimental methods, this technique is highly sensitive to the magnetic signal34353637 and information can be extracted across the entire film thickness with unrivalled spatial resolution, notably along the interfaces, compared to polarized neutron reflectometry. In situ EH experiments were performed on a cross-sectional 50 nm thick FeRh film to fully investigate the magnetic transition mechanism at a nanometre scale, with the objective to unravel the different effects attributed to size and interfaces.…”

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Inhomogeneous spatial distribution of the magnetic transition in an iron-rhodium thin film

et al. 2017

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Monitoring a magnetic state using thermal or electrical activation is mandatory for the development of new magnetic devices, for instance in heat or electrically assisted magnetic recording or room-temperature memory resistor. Compounds such as FeRh, which undergoes a magnetic transition from an antiferromagnetic state to a ferromagnetic state around 100 °C, are thus highly desirable. However, the mechanisms involved in the transition are still under debate. Here we use in situ heating and cooling electron holography to quantitatively map at the nanometre scale the magnetization of a cross-sectional FeRh thin film through the antiferromagnetic–ferromagnetic transition. Our results provide a direct observation of an inhomogeneous spatial distribution of the transition temperature along the growth direction. Most interestingly, a regular spacing of the ferromagnetic domains nucleated upon monitoring of the transition is also observed. Beyond these findings on the fundamental transition mechanisms, our work also brings insights for in operando analysis of magnetic devices.

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Inhomogeneous spatial distribution of the magnetic transition in an iron-rhodium thin film

et al. 2017

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“…Lowering the reaction temperature or changing the amine/acid allowed favoring the coalescence, yielding stars and porous cubes . Replacing carboxylic acid by ammonium chloride salt changed the iron intermediates formed and thus fastened the reaction kinetic, yielding larger spheres and cubes ,,. To go beyond these results, we now need to gain control on the initial nucleation step.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle Ripening : A Versatile Approach for the Size and Shape Control of Metallic Iron Nanoparticles

et al. 2019

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A novel approach for the synthesis of Fe(0) nanoparticles (NPs) with tunable sizes and shapes is reported. Ultrasmall Fe(0) NPs were reacted under mild conditions in the presence of a mixture of palmitic acid and amine ligands. These NPs acted not only as preformed seeds but also as an internal iron(II) source that was produced by the partial dissolution of the NPs by the acid. This fairly simple approach allows the strict separation of the nucleation and the growth steps. By changing the acid concentration, a fine tuning of the relative ratio between the remaining Fe(0) seeds and the iron(II) reservoir was achieved, giving access to both size (from 7 to 20 nm) and shape (spheres, cubes or stars) control. The partial dissolution of the ultrasmall Fe(0) NPs into iron(II) source and the successive growth was further studied by using combined TEM and Mössbauer spectroscopy. The successive corrosion, coalescence, and ripening observed could be understood in the framework of an environment‐dependent growth model.

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“…[22][23][24][25][26] We have thus in situ investigated the magnetostructural phase transition in a cross-sectional 180 nm thick…”

Section: Introduction Epitaxial Mnas Thin Films Onmentioning

confidence: 99%

In Depth Spatially Inhomogeneous Phase Transition in Epitaxial MnAs Film on GaAs(001)

Gatel

Serin

et al. 2017

Nano Lett.

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Abstract. Most studies on MnAs material in its bulk form have been focused on its temperature dependent structural phase transition accompanied by a magnetic one.Magnetostructural phase transition parameters in thin MnAs films grown on GaAs substrate present however some differences from the bulk behavior, and local studies become mandatory for a deeper understanding of the mechanisms involved within the transition. Up to now, only surface techniques have been carried on, while the transition is a three dimensional phenomenon. We therefore developed an original nanometer scale methodology using electron holography to investigate the phase transition in an epitaxial MnAs thin film on GaAs(001) from the cross-section view. Using quantitative magnetic maps recorded at the nanometer scale as function of the temperature, our work provides a direct in situ observation of the inhomogeneous spatial distribution of the transition in the layer depth and brings new insights on the fundamental transition mechanisms.

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Size-Specific Spin Configurations in Single Iron Nanomagnet: From Flower to Exotic Vortices

Cited by 68 publications

References 31 publications

Inhomogeneous spatial distribution of the magnetic transition in an iron-rhodium thin film

Inhomogeneous spatial distribution of the magnetic transition in an iron-rhodium thin film

Nanoparticle Ripening : A Versatile Approach for the Size and Shape Control of Metallic Iron Nanoparticles

In Depth Spatially Inhomogeneous Phase Transition in Epitaxial MnAs Film on GaAs(001)

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