Angular dependence of magnetic properties in Ni nanowire arrays

Lavín, R.; Denardin, Juliano C.; Escrig, Juan; Altbir, D.; Gómez, H.

doi:10.1063/1.3257242

Cited by 118 publications

(68 citation statements)

References 32 publications

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“…Many groups have studied the size dependant magnetic properties of NWs [14][15][16]. For magnetic recording applications the NW diameter is desired as small as possible, while for other applications such as in microwave and magneto-optical devices the NW with large diameters are favorable [17,18]. Qin et al [15] and Han et al [14] have reported Ni NWs with large diameters and explored their angular dependent magnetic properties in detail.…”

Section: Introductionmentioning

confidence: 98%

Fabrication and temperature dependent magnetic properties of nickel nanowires embedded in alumina templates

Adeela

Maaz

Khan

et al. 2015

Ceramics International

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Section: Introductionmentioning

confidence: 98%

Fabrication and temperature dependent magnetic properties of nickel nanowires embedded in alumina templates

Adeela

Maaz

Khan

et al. 2015

Ceramics International

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“…5 shows a good agreement between the experimental results (dots) and theoretical calculations (line), performed using SðhÞ ¼ S 0 jcos hj, where S 0 ¼ Sðh ¼ 0 Þ. 15 To investigate the magnetization reversal processes of Co NW and NT arrays, we analyzed the angular dependence of H c . Previous works reported analytical calculations of the magnetic reversal modes [coherent (C) magnetization rotation, and transverse (T) and vortex-like (V) domain walls] that are energetically more favorable for high aspect ratio NWs and NTs.…”

Section: B Magnetization Reversalmentioning

confidence: 95%

“…Previous works reported analytical calculations of the magnetic reversal modes [coherent (C) magnetization rotation, and transverse (T) and vortex-like (V) domain walls] that are energetically more favorable for high aspect ratio NWs and NTs. 8,[13][14][15]20,27,[38][39][40] For analytical calculations it is important to define the parameter b ¼ d i =d, where d i and d are the NT inner and outer diameters, respectively, (Fig. 5).…”

Section: B Magnetization Reversalmentioning

confidence: 99%

“…13 In recent reports a simple analytical model has been proposed to understand the magnetization reversal processes by predicting the variation of the coercivity with the angle of applied external magnetic field (H) and allowing the understanding of the magnetization reversal processes for NW and NT arrays with different geometrical parameters. [13][14][15] Nanoporous alumina templates (NpATs) have been extensively used for the growth of NWs and NTs as they offer the possibility to build ordered arrays of aligned nanostructures and the ability to easily control the required dimensions by changing the anodization conditions. 16,17 Controlling the applied potential and the electrolyte type, concentration and temperature, one can easily obtain ordered hexagonal arrays of nanopores with diameters between 20 and 200 nm and interpore distances in the range of 60-500 nm.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic interactions and reversal mechanisms in Co nanowire and nanotube arrays

Proença¹,

Sousa

Escrig

et al. 2013

Journal of Applied Physics

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Ordered hexagonal arrays of Co nanowires (NWs) and nanotubes (NTs), with diameters between 40 and 65 nm, were prepared by potentiostatic electrodeposition into suitably modified nanoporous alumina templates. The geometrical parameters of the NW/NT arrays were tuned by the pore etching process and deposition conditions. The magnetic interactions between NWs/NTs with different diameters were studied using first-order reversal curves (FORCs). From a quantitative analysis of the FORC measurements, we are able to obtain the profiles of the magnetic interactions and the coercive field distributions. In both NW and NT arrays, the magnetic interactions were found to increase with the diameter of the NWs/NTs, exhibiting higher values for NW arrays. A comparative study of the magnetization reversal processes was also performed by analyzing the angular dependence of the coercivity and correlating the experimental data with theoretical calculations based on a simple analytical model. The magnetization in the NW arrays is found to reverse by the nucleation and propagation of a transverse-like domain wall; on the other hand, for the NT arrays a non-monotonic behavior occurs above a diameter of $50 nm, revealing a transition between the vortex and transverse reversal modes. V C 2013 American Institute of Physics. [http://dx

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“…En particular, resulta atractivo el estudio de sistemas nanométricos metálicos (como el Ni) debido a su pequeña anisotropía magneto-cristalina y potenciales aplicaciones en dispositivos magnéticos [9][10][11][12].…”

Section: Introductionunclassified

Influencia de la porosidad en las propiedades magnéticas de arreglos de nanohilos de Ni

Meneses

Bercoff

2015

Matéria (Rio J.)

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RESUMENSe estudiaron las propiedades de histéresis magnética de arreglos ordenados de nanohilos de Ni, electrodepositados éstos en una membrana de alúmina con un arreglo hexagonal de poros cilíndricos. Se analizó el efecto de la geometría de los nanohilos individuales (diámetro y longitud) y del ordenamiento y porosidad del arreglo sobre la coercitividad y la remanencia del conjunto. Las membranas de alúmina auto-ensambladas se sintetizaron por anodizado en dos pasos, usando una celda electroquímica y potencial eléctrico constante. Se variaron los diámetros de poro entre 20 nm y 40 nm (no así la distancia media entre ellos) sumergiendo las membranas en ácido fosfórico al 5% durante distintos tiempos. Estas membranas se caracterizaron por microscopía de barrido (SEM). Los nanohilos de Ni se obtuvieron por electrodeposición AC, a 20 V, 200 Hz y temperatura ambiente. Una vez sintetizados, los arreglos de nanohilos se caracterizaron estructuralmente por SEM y magnéticamente usando un SQUID. Se observa que las propiedades magnéticas de los arreglos son fuertemente dependientes de la relación largo/diámetro de los nanohilos, la que regula el valor de su anisotropía de forma, y también de la porosidad, que determina la magnitud del campo de interacción dipolar que percibe cada nanohilo por la presencia de sus vecinos en el arreglo. En particular, se encontró que la coercitividad decrece con la porosidad y que el parámetro ε, que regula la intensidad de las barreras de energía del sistema, debe ser variable y depender de la porosidad del arreglo para ajustar bien los datos experimentales. Palabras clave: Nanohilos, Propiedades magnéticas, Níquel ABSTRACTThe hysteresis properties of ordered arrays of Ni nanowires, electrodeposited into cylindrical nanoporous alumina membranes were investigated. The effect of the nanowire geometry (diameter and length), the array order and the nanowires' volume fraction on the array coercivity and remanence were analyzed. Porous alumina membranes were produced by a two-step anodization process in a potentiostatic electrochemical cell. The pores' diameters were varied from 20 nm to 40 nm by immersing the membranes in a 5% phosphoric acid solution for different times. The membranes were characterized using a scanning electron microscope (SEM) and both the pore size distribution as well as their separation were determined. These membranes were used as templates for the AC electrodeposition of Ni nanowires, using a voltage of 20 V and a frequency of 200 Hz, at room temperature. The Ni nanowire arrays were structurally and magnetically characterized by SEM and with a SQUID magnetometer, respectively, at room temperature. It was found that the magnetic properties of the array strongly depend on the nanowires aspect ratio -length/diameter ratio-which regulates the wire shape anisotropy and also on the porosity, which determines the magnitude of the dipolar interaction field acting on the array. Particulary, it was found that coercitivity decreases with porosity and that the parameter ε, which is...

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Angular dependence of magnetic properties in Ni nanowire arrays

Cited by 118 publications

References 32 publications

Fabrication and temperature dependent magnetic properties of nickel nanowires embedded in alumina templates

Fabrication and temperature dependent magnetic properties of nickel nanowires embedded in alumina templates

Magnetic interactions and reversal mechanisms in Co nanowire and nanotube arrays

Influencia de la porosidad en las propiedades magnéticas de arreglos de nanohilos de Ni

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