Magnetic properties of nanosized wires

Meier, J.; Doudin, B.; Ansermet, Jean-Philippe

doi:10.1063/1.362136

Cited by 98 publications

(59 citation statements)

References 17 publications

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“…Co/Cu multilayers are grown by electrodeposition in commercial ion-track-etched polycarbonate membranes of 6 mm in thickness [9,10]. The electroplating is performed in the conventional tree electrodes method.…”

Section: Techniquementioning

confidence: 99%

Lithography-free study of spin torque

Murè

Biziere

Ansermet

2010

Journal of Magnetism and Magnetic Materials

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a b s t r a c tWe developed a non-lithographic technique to contact sub-100 nm nanowires for spin transfer torque experiments. Co/Cu multilayers were grown by electrodeposition in nanoporous commercial polycarbonate membranes from a Co/Cu bath. A home-made sample holder allows bottom and top electrical contacts to be made to individual nanowires in the CPP geometry. Experimental evidence of the spin transfer torque effect is given for (Co/Cu) n multilayers by recording dV/dI spectra as a function of the DC current amplitude.

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Section: Techniquementioning

confidence: 99%

Lithography-free study of spin torque

Murè

Biziere

Ansermet

2010

Journal of Magnetism and Magnetic Materials

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“…Among them, Cobased anisotropic nanomaterials are attracting a great part of scientific interest mainly for their possible applications as nanomagnets in (nano)medicine [10] and recording media [11], and as building blocks in high energy nanostructured bulk magnets [12]. All these studies showed that depending on the elaboration process, the nanowires can present very different size, shape, morphology and crystal symmetry as well as very different as-grown spacing between the nano-objects [7,[14][15][16][17][18][19][20][21][22]. Thus, altogether, those parameters give rise to a wide ensemble of magnetic behaviors that are far from being fully controlled.…”

Section: Introductionmentioning

confidence: 99%

Morphology control of the magnetization reversal mechanism in Co80Ni20 nanomagnets

Mercone

Zighem

Léridon

et al. 2015

Journal of Applied Physics

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Nanowires with very different size, shape, morphology and crystal symmetry can give rise to a wide ensemble of magnetic behaviors whose optimization determines their applications in nanomagnets. We present here an experimental work on the shape and morphological dependence of the magnetization reversal mechanism in weakly interacting Co80Ni20 hexagonal-close-packed nanowires. Non-agglomerated nanowires (with length L and diameter d) with a controlled shape going from quasi perfect cylinders to diabolos, have been studied inside their polyol solution in order to avoid any oxidation process. The coercive field HC was found to follow a standard behavior and to be optimized for an aspect ratio L d > 15. Interestingly, an unexpected behavior was observed as function of the head morphology leading to the strange situation where a diabolo shaped nanowire is a better nanomagnet than a cylinder. This paradoxical behavior can be ascribed to the growth-competition between the aspect ratio L d and the head morphology ratio d D (D being the head width). Our experimental results clearly show the importance of the independent parameter (t = head thickness) that needs to be considered in addition to the shape aspect ratio ( L d ) in order to fully describe the nanomagnets magnetic behavior. Micromagnetic simulations well support the experimental results and bring important insights for future optimization of the nanomagnets morphology.

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“…It was presented in Refs. [7,8] that the uniaxial anisotropy may be related to the presence of the polycarbonate membrane and to the chemical bonding existing between polycarbonate matrix and Ni wires. The thermal stresses induced in the nanowires due to the different thermal expansion constants of the Ni and polycarbonate result in magnetostrictive effects which should be taken into account.…”

Section: Resultsmentioning

confidence: 99%

Thermal Evolution of Magnetic Interactions in Ni Nanowires Embedded in Polycarbonate Membranes by Ferromagnetic Resonance

Ghaddar¹,

Gieraltowski²,

Gloaguen

et al. 2009

Acta Phys. Pol. A

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Ni polycrystalline nanowires with diameters of 50, 80, and 100 nm were electrodeposited in cylindrical pores of track-etched polycarbonate membranes. Their magnetic properties were determined as a function of temperature using ferromagnetic resonance and magnetization measurements. At room temperature, the uniaxial anisotropy is equal to the shape anisotropy whereas an additional contribution is evidenced at low temperature. This additional contribution is attributed to magnetoelastic effects induced in the nanowires due to the different thermal expansion constants of Ni and polycarbonate. The analysis of magnetization processes in Ni nanowire arrays evidenced strong dipolar interactions inside the wires due to the domain structure. The coercive field of the nanowires was shown to be nearly a linear function of the temperature and could be accounted for temperature dependence of the uniaxial anisotropy.

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Magnetic properties of nanosized wires

Cited by 98 publications

References 17 publications

Lithography-free study of spin torque

Lithography-free study of spin torque

Morphology control of the magnetization reversal mechanism in Co80Ni20 nanomagnets

Thermal Evolution of Magnetic Interactions in Ni Nanowires Embedded in Polycarbonate Membranes by Ferromagnetic Resonance

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