Exchange bias in nanopatterned Co antidots prepared by self-assembling polystyrene nanospheres

Coı̈sson, M.; Boarino, Luca; Celegato, Federica; Leo, Natascia De; Tiberto, P.; Vinai, F.

doi:10.1007/s11051-011-0309-z

Cited by 7 publications

(5 citation statements)

References 46 publications

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“…In fact, a native oxide layer develops on the top surface of the Co dots. Since Co-oxide is an antiferromagnet [ 42 ], it can be the source of this exchange bias effect [ 43 ]. Indeed, the bias field is reported in Figure 8 d for the Co dots and the BN samples, showing that the effect is identical.…”

Section: Resultsmentioning

confidence: 99%

Bi-Component Nanostructured Arrays of Co Dots Embedded in Ni80Fe20 Antidot Matrix: Synthesis by Self-Assembling of Polystyrene Nanospheres and Magnetic Properties

et al. 2017

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A bi-component nanostructured system composed by a Co dot array embedded in a Ni80Fe20 antidot matrix has been prepared by means of the self-assembling polystyrene nanospheres lithography technique. Reference samples constituted by the sole Co dots or Ni80Fe20 antidots have also been prepared, in order to compare their properties with those of the bi-component material. The coupling between the two ferromagnetic elements has been studied by means of magnetic and magneto-transport measurements. The Ni80Fe20 matrix turned out to affect the vortex nucleation field of the Co dots, which in turn modifies the magneto-resistance behaviour of the system and its spinwave properties.

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Section: Resultsmentioning

confidence: 99%

Bi-Component Nanostructured Arrays of Co Dots Embedded in Ni80Fe20 Antidot Matrix: Synthesis by Self-Assembling of Polystyrene Nanospheres and Magnetic Properties

et al. 2017

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“…The PN particles have been then reduced in size by reactive ion etching in O 2 plasma and then used as a mask for sputter deposition of a wide variety of magnetic elements and alloys (i.e. Ni, Co, Ni 80 Fe 20 , Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 and Fe 78 B 13 Si 9 with varying film thickness from 10 -60 nm) [4,5]. Subsequently, the PN particles have been removed by sonication, giving rise to an anti-dotted structure consisting in an array of nanoholes.…”

Section: Methodsmentioning

confidence: 99%

Large-area patterned magnetic nanostructures by self-assembling of polystyrene nanospheres

et al. 2012

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In this work, dot and anti-dot structures in Co, Ni, Ni 80 Fe 20 , Fe 50 Pd 50 , Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 and Fe 78 B 13 Si 9 thin films have been produced by means of nanosphere lithography. Two multi-step processes have been followed and will be here described. The first one directly exploits polystyrene nanosheres (PN) as a mask to fabricate arrays of magnetic nanoholes and dots. In the second case, the nanospheres are used to design a polymeric mask of a photoresist subsequently used to pattern a magnetic nanostructure on a film. Advantages and disadvantages of the two lithographical techniques will be here highlighted. In both processes, the dimension and mutual distance of the patterns are dependent on the starting PN diameter (in the interval 500-800 nm). Samples microstructure has been studied by means of SEM and AFM microscopy. Room-temperature hysteresis loops have been measured by an AGFM (Alternating Gradient Field Magnetometer). MFM microscopy has been exploited to study the magnetic domain pattern. All produced systems have been observed to display tunable microstructure and, consequently, various magnetic properties for application.

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“…Nanosphere lithography (NSL) is a promising low-cost nanofabrication technique for patterning nanostructure arrays. The recent demonstration of magnetic nanodot [24][25][26][27][28][29] and antidot [30][31][32] structures and spin valve nanopillars [33] fabricated by NSL have proved its feasibility in patterning nanostructures for investigating magnetic properties. In this work, NSL is engaged for parallel fabrication of large-area CoFeB/IrMn nanodot and antidot arrays with diameters of less than 100 nm.…”

Section: Introductionmentioning

confidence: 99%

Exchange bias study of CoFeB/IrMn antidot and nanodot arrays fabricated by nanosphere lithography

Leung

Lin

et al. 2016

2016 5th International Symposium on Next-Generation Electronics (ISNE)

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Exchange-biased bilayers are widely used as reference layers in nanometric spintronic devices. While the magnetic properties of polycrystalline multilayers are widely reported, the exchange bias effect in nanostructures containing amorphous ferromagnetic layers are not systematically investigated. In this work, CoFeB/IrMn antidot and nanodot arrays were patterned by nanosphere lithography. The average diameter of pores in the antidot arrays changes from 88 nm to 105 nm as the thin film thickness increases from 20.8 nm to 28.5 nm, while the size of nanodots are kept at 60 nm. The exchange bias and coercivity of the nanostructures and continuous films exhibit similar exponential dependence on CoFeB layer thickness. The vacuum annealing under magnetic field results in structural relaxation, interdiffusion, and CoFeB crystallization, as the annealing temperature is increased from 373 K to 673 K. These mechanisms are responsible for the changes in crystallinity, surface roughness, and magnetic properties. Reduced coercivity and enhanced exchange bias is observed after annealing at low temperatures, while high-temperature annealing (> 573 K) results in higher coercivity and lower exchange bias.This work provides physical insights on the magnetization reversal response in nanosized spintronic devices involving CoFeB/IrMn reference layers.

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Exchange bias in nanopatterned Co antidots prepared by self-assembling polystyrene nanospheres

Cited by 7 publications

References 46 publications

Bi-Component Nanostructured Arrays of Co Dots Embedded in Ni80Fe20 Antidot Matrix: Synthesis by Self-Assembling of Polystyrene Nanospheres and Magnetic Properties

Bi-Component Nanostructured Arrays of Co Dots Embedded in Ni80Fe20 Antidot Matrix: Synthesis by Self-Assembling of Polystyrene Nanospheres and Magnetic Properties

Large-area patterned magnetic nanostructures by self-assembling of polystyrene nanospheres

Exchange bias study of CoFeB/IrMn antidot and nanodot arrays fabricated by nanosphere lithography

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