Magnetic multilayers on nanosphere arrays with various curvature radius

Yang, Jing; Yang, Nannan; Wang, Y.X.; Zhang, Y.J.; Zhang, Y.M.; Liu, Y.; Wei, Maobin; Yu, Yang; Wang, R.; Yang, See-Hun

doi:10.1016/j.ssc.2011.07.010

Cited by 8 publications

(4 citation statements)

References 23 publications

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“…The material deposited on the spheres forms curved magnetic "caps" which have an easy axis that is parallel to the surface of the sphere and a radial thickness dependence from center to edge. The curvature of the nanocaps leads to novel features in domain structure and quasistatic switching behavior that have been studied extensively [8][9][10][11][12][13] . For example, Albrecht et al 14 deposited ferromagnetic, single-domain Co/Pd multilayers onto self-assembled nanospheres, resulting in quasistatic switching behavior that deviated from simple Stoner-Wohlfarth switching as a result of the relative geometry of the applied field angle and the varying easy axis direction and strength across the cap.…”

Section: Introductionmentioning

confidence: 99%

Size-dependent magnetization switching characteristics and spin wave modes of FePt nanostructures

Brandt

Rückriem

Gilbert

et al. 2013

Journal of Applied Physics

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We present a comprehensive investigation of the size-dependent switching characteristics and spin wave modes of FePt nanoelements. Curved nanomagnets ("caps") are compared to flat disks of identical diameter and volume over a size range of 100 to 300nm. Quasi-static magnetization reversal analysis using first-order reversal curves (FORC) shows that spherical caps have lower vortex nucleation and annihilation fields than the flat disks. As the element diameter decreases, the reversal mechanism in the caps crosses over sooner to coherent rotation than in the disks. The magnetization dynamics are studied using optically induced small angle precession and reveal a strong size dependence that differs for the two shapes. Flat disks exhibit well-known center and edge modes at all sizes, but as the diameter of the caps increases from 100 to 300 nm, additional oscillation modes appear in agreement with dynamic micromagnetic simulations. In addition, we show that the three-dimensional curvature of the cap causes a much greater sensitivity to the applied field angle which provides an additional way for controlling the ultrafast response of nanomagnetic elements.

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Section: Introductionmentioning

confidence: 99%

Size-dependent magnetization switching characteristics and spin wave modes of FePt nanostructures

Brandt

Rückriem

Gilbert

et al. 2013

Journal of Applied Physics

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“…This technique is specifically useful for the synthesis of ″magnetic nanocaps″, which consist of isolated nanomagnets having negligible or limited dipole and exchange interaction among nearest neighbors [7]. The magnetic nanocaps made from Co and Co based magnetic nanostructures have attracted a lot of attention for their possible applications in next generation magnetic storage devices [7,9]. Yet, other magnetic material including Ni may also be useful for such purpose and a need to explore them is felt.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties of Ni Thin Films Deposited on to Polystyrene Nanospheres

Kumar¹,

Tripathi²,

Sharma³

2021

J. Nano- Electron. Phys.

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Structural and magnetic properties of Ni magnetic nanocaps synthesized using electron beam evaporation technique under ultra high vacuum conditions are presented for two Ni layer thicknesses, namely 10 nm and 20 nm. To prepare them, Si (100) substrate was first drop coated with soft polystyrene (PS) nanopheres with the average diameter of 800 nm followed by the evaporation of Ni onto dried substrate. For the comparative analysis, the films were simultaneously deposited on plane Si substrate. The films were characterized for their crystalline properties using X-ray diffraction measurement in grazing incidence geometry, while other structural properties such as roughness and thickness of these films were extracted from the fitting of X-ray reflectivity data. The parameters were then correlated with the magnetism observed in these films using magneto-optical Kerr effect (MOKE) technique. The influence of thickness in these properties is discussed here.

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“…The magnetic storage devices depend on the capacity to develop more sensitive sensors, and materials capable to overcome the SP limit, because it provokes the thermal destabilization of the recording units [15,16]. Numerous experimental investigations are developed on magnetic features of core/shell NPs composed by bimetallic magnetic Iron-based (Fe@Au) [17], Cobalt-Based (Co@Pt) [18] or Ni-Based (Ni@Pd) [19] and core/shell nanoclusters or ferromagnetic (FM) core (metal magnetic) surrounded by an antiferromagnetic (AFM) shell (usually an oxide) [20]. Theoretically, the core/shell nanostructures in different morphologies (NPs, nanowires, nanotubes, etc.)…”

Section: Introductionmentioning

confidence: 99%