Tailoring the magnetic properties of cobalt antidot arrays by varying the pore size and degree of disorder

Abstract

Abstract.We study the influence of the porosity on the domain structure of cobalt antidots thin films with controlled and circular defects of 20, 40 and 60 nm of diameter. Micromagnetic simulations, combined with First-order reversal curves analysis of classical magnetometry measurements, have been used to track the evolution of the magnetic domain configurations. The found coercivity enhancement with the increase of the pore diameter is correlated to the domain reversibility. Moreover, we found that when the pores diameter increases the domain-domain interactions become dominant.

Enhanced Hall effect in Co/Pd multilayered nanodomes with perpendicular anisotropy

“…12 The first step consists of the fabrication of NAMs by double anodization technique 14,15 and subsequent removal of the remaining Al by chemical etching, exposing the bottom oxide barrier layer. Two sets of membranes were fabricated, with different anodization voltages in order to obtain different pore sizes.…”

Magnetic Properties of Co/Cu/Py Antidot Films With Different Pore Diameters

“…In order to perform the micromagnetic simulations, SEM images as from Figure 1 were treated by image filters and used as masks in OOMMF [9,24] When the size of the pores increase, and the space for the propagation of the domain walls is reduced, the interaction among different propagating domains produces multiple smaller domains and consequently gives rise to a more complex magnetic domain structure, which results in an increase in the coercivity of the films. It is also possible to observe in the images of Figure 4 the presence of some kind of vortex behavior in the region between some pores.…”

“…In order to perform the micromagnetic simulations, SEM images as from Figure 1 were treated by image filters and used as masks in OOMMF [9,24], allowing us reproducing the typical defects observed in the samples.…”

“…Antidots of NiFe (Py) [1,[5][6][7][8][9][10][11][12][13][14][15][16] and Ni [17,18] films are widely studied presenting an increased coercivity compared to the continuous form. Antidots made of Co present a large enhancement of the coercivity [2][3][4][19][20][21][22][23][24], and are usually deposited with Pt for out of plane recording purposes [25][26][27]. Arrays of Co/Cu/NiFe, CoFe/Cu/NiFe and [Co/Cu] N multilayered antidots have been studied previously by means of magneto-transport measurements [28][29][30].…”

Магнитные свойства многослойных пленок Co/Pd на пористых темплатах Al-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- с развитой субструктурой ячеек

“…Наноструктурированные магнитные пленки, форми-руемые путем создания упорядоченной сетки нанопор ( " антиточек") в диапазоне диаметров 10−200 nm, пер-спективны для создания электронных устройств нового поколения (магниточувствительных транзисторов) [1][2][3], сенсоров [4][5][6] и магнонных кристаллов [7][8][9][10]. От-дельным направлением в изучении подобных массивов " антиточек" является синтез и исследование пористых пленок, проявляющих свойство перпендикулярной маг-нитной анизотропии (ПМА), поскольку они могут быть использованы в качестве сред для магнитной записи высокой плотности [11][12][13].…”