Magnetic properties of granular CoCrPt:SiO2 films as tailored by Co+ irradiation

Tibus, Stefan; Strache, Thomas; Springer, F.; Makarov, Denys; Rohrmann, H.; Schrefl, T.; Faßbender, J.; Albrecht, Manfred

doi:10.1063/1.3393960

Cited by 8 publications

(10 citation statements)

References 25 publications

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“…By using magnetic ions, we can directly influence the intergranular exchange by introducing Co atoms into the grain boundaries, which allows us to tailor the magnetic exchange coupling between CoCrPt grains in a controlled manner [65]. In particular, we found that irradiation at low fluences results in the increase of the exchange coupling leading to a substantial increase of the remanent magnetization.…”

Section: Granular Cocrpt-sio 2 Alloy Films On Sio 2 Particle Arraysmentioning

confidence: 83%

Magnetic Films on Nanoparticle Arrays

Albrecht¹

2012

TOSURSJ

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Novel properties originating from the combination of magnetism with the reduced dimensionality of nanoobjects are of considerable interest for fundamental science but are also readily used in a wide range of technological applications. To fulfill the demand for larger capacities of storage systems, complex magnetic heterostructures of a nanometer size are envisioned as future magnetic storage media. Here we review recent advances on a novel gradient nanomaterial fabricated by deposition of magnetic thin films onto self-assembled arrays of nonmagnetic spherical particles, resulting in arrays of magnetic caps. Due to the curvature of the particle's surface, magnetic and structural properties of the magnetic thin films differ substantially from their planar counterparts with respect to the equilibrium magnetic domain pattern as well as magnetization reversal behavior. It will be shown that varying the size of the particles as well as the thickness of the deposited layers, the magnetostatic and exchange coupling between the neighboring caps can be systematically modified, providing direct access to the change of fundamental magnetic interactions at the nanoscale. Furthermore, these magnetic cap structures were employed to realize so called bit patterned magnetic media, which is one of the most promising concepts in magnetic data storage to provide areal densities beyond 1 Tbit/inch 2 . In this respect, important aspects regarding the potential application of the magnetic cap structures in magnetic data storage will be addressed.

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Section: Granular Cocrpt-sio 2 Alloy Films On Sio 2 Particle Arraysmentioning

confidence: 83%

Magnetic Films on Nanoparticle Arrays

Albrecht¹

2012

TOSURSJ

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“…The observed feather-like domains can be explained based on the IP magnetization distribution and transport of the magnetic charge toward the surface, which is achieved by a small deviation from the IP magnetization, similar to the formation of cross-tie walls . The modified domain morphologies can be different for different material systems and choice of ions . The surface roughness of the films increases with higher ion energy, and the fragmented maze-like domains could not be observed for the irradiated samples with E = 100 keV; the corresponding AFM and MFM images are presented in Figure S2 of the Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

“… 62 The modified domain morphologies can be different for different material systems and choice of ions. 63 The surface roughness of the films increases with higher ion energy, and the fragmented maze-like domains could not be observed for the irradiated samples with E = 100 keV; the corresponding AFM and MFM images are presented in Figure S2 of the Supporting Information . Thus, variation in the domain size and pattern can be tuned via locally competing anisotropies, which create a strong force for the SRT toward the IP direction.…”

Section: Resultsmentioning

confidence: 99%

Understanding the Magnetic Microstructure through Experiments and Machine Learning Algorithms

Talapatra

Gajera

et al. 2022

ACS Appl. Mater. Interfaces

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Advanced machine learning techniques have unfurled their applications in various interdisciplinary areas of research and development. This paper highlights the use of image regression algorithms based on advanced neural networks to understand the magnetic properties directly from the magnetic microstructure. In this study, Co/Pd multilayers have been chosen as a reference material system that displays maze-like magnetic domains in pristine conditions. Irradiation of Ar+ ions with two different energies (50 and 100 keV) at various fluences was used as an external perturbation to investigate the modification of magnetic and structural properties from a state of perpendicular magnetic anisotropy to the vicinity of the spin reorientation transition. Magnetic force microscopy revealed domain fragmentation with a smaller periodicity and weaker magnetic contrast up to the fluence of 1014 ions/cm2. Further increases in the ion fluence result in the formation of feather-like domains with a variation in local magnetization distribution. The experimental results were complemented with micromagnetic simulations, where the variations of effective magnetic anisotropy and exchange constant result in qualitatively similar changes in magnetic domains, as observed experimentally. Importantly, a set of 960 simulated domain images was generated to train, validate, and test the convolutional neural network (CNN) that predicts the magnetic properties directly from the domain images with a high level of accuracy (maximum 93.9%). Our work has immense importance in promoting the applications of image regression methods through the CNN in understanding integral magnetic properties obtained from the microscopic features subject to change under external perturbations.

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“…Ga, He and Ar [7,[22][23][24][25][26], or magnetic ion specimens, i.e. Co [27], was recently introduced.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we demonstrate the possibility to tune the magnetic properties of CoCrPt:SiO 2 films grown on selfassembled arrays of SiO 2 spherical particles using irradiation with magnetic Co + ions. By using magnetic ions, we can directly influence the intergranular exchange by introducing Co atoms into the grain boundaries, which allows us to tailor the magnetic exchange coupling between CoCrPt grains in a controlled manner [27], thus influencing the integral magnetic properties, i.e. remanence magnetization, coercive field and magnetic domain configuration.…”

Section: Introductionmentioning

confidence: 99%

Nanocap arrays of granular CoCrPt:SiO₂films on silica particles: tailoring of the magnetic properties by Co⁺irradiation

et al. 2010

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An approach for tailoring the magnetic properties by ion irradiation of granular perpendicular CoCrPt:SiO(2) films grown on silica particles with sizes down to 10 nm was investigated. The as-prepared samples reveal an intriguing scaling dependence of the coercive field and remnant magnetization: both parameters are found to decrease with decreasing particle size. However, Co(+) irradiation at a low fluence of 0.5 x 10(14) cm(-2) already results in an opposite scaling behavior. It is assumed that this modification is due to the enhancement of the intergranular magnetic exchange coupling of the granular CoCrPt:SiO(2) film initiated by Co(+) irradiation resulting in a modified reversal behavior. Further increase of the irradiation fluence beyond 1.6 x 10(14) ions cm(-2) leads to a degradation of the magnetic layer properties, lowering the remnant magnetization and the coercive field in the easy-axis direction. Moreover, the local magnetic properties of the samples were analyzed by magnetic force microscopy revealing magnetic multi-domain cap structures.

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Magnetic properties of granular CoCrPt:SiO2 films as tailored by Co+ irradiation

Abstract: Articles you may be interested inSuccessful fabrication of high K u columnar CoPt-SiO2 granular film sputtered under high substrate temperature

Cited by 8 publications

References 25 publications

Magnetic Films on Nanoparticle Arrays

Magnetic Films on Nanoparticle Arrays

Understanding the Magnetic Microstructure through Experiments and Machine Learning Algorithms

Nanocap arrays of granular CoCrPt:SiO₂films on silica particles: tailoring of the magnetic properties by Co⁺irradiation

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Magnetic properties of granular CoCrPt:SiO2 films as tailored by Co+ irradiation

Abstract: Articles you may be interested inSuccessful fabrication of high K u columnar CoPt-SiO2 granular film sputtered under high substrate temperature

Cited by 8 publications

References 25 publications

Magnetic Films on Nanoparticle Arrays

Magnetic Films on Nanoparticle Arrays

Understanding the Magnetic Microstructure through Experiments and Machine Learning Algorithms

Nanocap arrays of granular CoCrPt:SiO2films on silica particles: tailoring of the magnetic properties by Co+irradiation

Contact Info

Product

Resources

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Nanocap arrays of granular CoCrPt:SiO₂films on silica particles: tailoring of the magnetic properties by Co⁺irradiation