Magnetic anisotropy of embedded Co nanoparticles: Influence of the surrounding matrix

Tamion, Alexandre; Raufast, Cécile; Hillenkamp, Matthias; Bonet, Edgar; J., Jouanguy
,; Canut, B.; Bernstein, E.; Boisron, Olivier; Wernsdorfer, Wolfgang; Dupuis, V.

doi:10.1103/physrevb.81.144403

Cited by 46 publications

(39 citation statements)

References 19 publications

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“…We also assume that the particles are far enough from each other so that they are not interacting (this corresponds to diluted samples of clusters embedded in a matrix, as those of Refs. [18][19][20]). The easy magnetization axes are supposed to be randomly oriented, as is the case in most experiments.…”

Section: Introductionmentioning

confidence: 97%

Magnetic susceptibility curves of a nanoparticle assembly, I: Theoretical model and analytical expressions for a single magnetic anisotropy energy

Tournus

Bonet

2011

Journal of Magnetism and Magnetic Materials

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Section: Introductionmentioning

confidence: 97%

Magnetic susceptibility curves of a nanoparticle assembly, I: Theoretical model and analytical expressions for a single magnetic anisotropy energy

Tournus

Bonet

2011

Journal of Magnetism and Magnetic Materials

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“…3). One possible explanation could be the presence of a magnetic dead layer at the surface of these nanocrystallites that would decrease their magnetization [29], and in this case reduces it to zero, considering the small amount of these crystallized particles. Another one could be the reduction of exchange-coupling between adjacent nanoparticles through the increasingly paramagnetic amorphous matrix when the sample's temperature is higher than the Curie temperature T C of the amorphous matrix, as suggested by Hernando and Kulik [30].…”

Section: Resultsmentioning

confidence: 97%

Magnetic and magnetocaloric properties of the ternary Gd-based metallic glasses Gd60Mn30X10, with X=Al, Ga, In

Mayer

Chevalier

Gorsse

2010

Journal of Alloys and Compounds

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“…13 The magnetic anisotropy constant for 25-nm Ni nanoparticles in our Si sample is estimated to be at least on the order of $1.6 Â 10 4 J/m 3 , about three times the anisotropy constant in bulk Ni material, 32 implying that the interface between Ni particles and their Si surroundings may play a key role in magnetic switching of embedded Ni particles. 33 Alternatively, magnetoelastic anisotropy due to strains around magnetic nanoparticles may not be ignored. 34,35 In addition to enhanced surface/interface anisotropy, the inter-particle interactions may be partially responsible for the persistence of hysteretic behavior for Ni nanoparticles at room temperature.…”

Section: Implications On Magnetic Anisotropy and Particle Interactmentioning

confidence: 99%

Synthesis and properties of ferromagnetic nanostructures embedded within a high-quality crystalline silicon matrix via ion implantation and nanocavity assisted gettering processes

Malladi

Huang

Murray

et al. 2014

Journal of Applied Physics

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Integrating magnetic functionalities with silicon holds the promise of developing, in the most dominant semiconductor, a paradigm-shift information technology based on the manipulation and control of electron spin and charge. Here, we demonstrate an ion implantation approach enabling the synthesis of a ferromagnetic layer within a defect free Si environment by exploiting an additional implant of hydrogen in a region deep below the metal implanted layer. Upon post-implantation annealing, nanocavities created within the H-implanted region act as trapping sites for gettering the implanted metal species, resulting in the formation of metal nanoparticles in a Si region of excellent crystal quality. This is exemplified by the synthesis of magnetic nickel nanoparticles in Si implanted with H+ (range: ∼850 nm; dose: 1.5 × 1016 cm−2) and Ni+ (range: ∼60 nm; dose: 2 × 1015 cm−2). Following annealing, the H implanted regions populated with Ni nanoparticles of size (∼10–25 nm) and density (∼1011/cm2) typical of those achievable via conventional thin film deposition and growth techniques. In particular, a maximum amount of gettered Ni atoms occurs after annealing at 900 °C, yielding strong ferromagnetism persisting even at room temperature, as well as fully recovered crystalline Si environments adjacent to these Ni nanoparticles. Furthermore, Ni nanoparticles capsulated within a high-quality crystalline Si layer exhibit a very high magnetic switching energy barrier of ∼0.86 eV, an increase by about one order of magnitude as compared to their counterparts on a Si surface or in a highly defective Si environment.

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Magnetic anisotropy of embedded Co nanoparticles: Influence of the surrounding matrix

Cited by 46 publications

References 19 publications

Magnetic susceptibility curves of a nanoparticle assembly, I: Theoretical model and analytical expressions for a single magnetic anisotropy energy

Magnetic susceptibility curves of a nanoparticle assembly, I: Theoretical model and analytical expressions for a single magnetic anisotropy energy

Magnetic and magnetocaloric properties of the ternary Gd-based metallic glasses Gd60Mn30X10, with X=Al, Ga, In

Synthesis and properties of ferromagnetic nanostructures embedded within a high-quality crystalline silicon matrix via ion implantation and nanocavity assisted gettering processes

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