Micromagnetic studies of cobalt microbars fabricated by nanoimprint lithography and electrodeposition

Grujicic, Darko; Pešić, Batrić

doi:10.1016/j.jmmm.2004.08.003

Cited by 13 publications

(11 citation statements)

References 39 publications

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“…This configuration has been obtained on a few wires (≈ 10%) and has been reproduced in the simulations (as for example in Fig 5e) for an anisotropy constant above 200.10 3 J.m -3 randomly orientated around the normal of the Co layers in a cone with an aperture angle up to 20°. It is interesting to note that such values of anisotropy amplitude and direction are similar to the one observed in [39][40][41][42] in hcp electrodeposited Co. Generally in such nanowires with a polycrystalline texture, Co presents many structural defects as stacking faults. It can become difficult to make the difference between hcp and fcc structures: it is then possible to get polycrystalline Co with structural properties mainly similar to fcc but with some magnetic characteristics corresponding to an hcp structure.…”

Section: Results and Analysissupporting

confidence: 73%

Magnetic Configurations in Co/Cu Multilayered Nanowires: Evidence of Structural and Magnetic Interplay

et al. 2016

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Off-axis electron holography experiments have been combined with micromagnetic simulations to study the remnant magnetic states of electrodeposited Co/Cu multilayered nanocylinders. Structural and chemical data obtained by transmission electron microscopy have been introduced in the simulations. Three different magnetic configurations such as an antiparallel coupling of the Co layers, coupled vortices, and a monodomain-like state have been quantitatively mapped and simulated. While most of the wires present the same remnant state whatever the direction of the saturation field, we show that some layers can present a change from an antiparallel coupling to vortices. Such a configuration can be of particular interest to design nano-oscillators with two different working frequencies.

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Section: Results and Analysissupporting

confidence: 73%

Magnetic Configurations in Co/Cu Multilayered Nanowires: Evidence of Structural and Magnetic Interplay

et al. 2016

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“…In detail, a NW has a stable magnetic state if its width is smaller than 7·Δ d , where Δ d is the dipolar exchange length [ 15 ], which is ca. 3.4 nm for Co [ 16 ]. Ring shapes have also been proposed as elements for magnetic memories thanks to their higher stability compared to filled shapes [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Magnetic characterization of cobalt nanowires and square nanorings fabricated by focused electron beam induced deposition

Venturi

Gazzadi

Tavabi

et al. 2018

Beilstein J. Nanotechnol.

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The magnetic properties of nanowires (NWs) and square nanorings, which were deposited by focused electron beam induced deposition (FEBID) of a Co carbonyl precursor, are studied using off-axis electron holography (EH), Lorentz transmission electron microscopy (L-TEM) and magnetic force microscopy (MFM). EH shows that NWs deposited using beam energies of 5 and 15 keV have the characteristics of magnetic dipoles, with larger magnetic moments observed for NWs deposited at lower energy. L-TEM is used to image magnetic domain walls in NWs and nanorings and their motion as a function of applied magnetic field. The NWs are found to have almost square hysteresis loops, with coercivities of ca. 10 mT. The nanorings show two different magnetization states: for low values of the applied in-plane field (0.02 T) a horseshoe state is observed using L-TEM, while for higher values of the applied in-plane field (0.3 T) an onion state is observed at remanence using L-TEM and MFM. Our results confirm the suitability of FEBID for nanofabrication of magnetic structures and demonstrate the versatility of TEM techniques for the study and manipulation of magnetic domain walls in nanostructures.

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“…[9,10]) or (2.2 − 3.3) × 10 −11 J/m (e.g. [11][12][13]). The experimental measurements on the exchange stiffness using Brillouin light scattering report values between 2.5 × 10 −11 J/m [14] and 3.6 × 10 −11 J/m [15].…”

Section: Introductionmentioning

confidence: 99%

Temperature-dependent exchange stiffness and domain wall width in Co

et al. 2016

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The micromagnetic exchange stiffness is a critical parameter in numerical modeling of magnetization dynamics and reversal processes, yet the current literature reports a wide range of values even for such simple and widely used material as Cobalt.With use of ab-intio estimated Heisenberg parameters we calculate the low temperature micromagnetic exchange stiffness parameters for hexagonal-close-packed (HCP) and face-centred cubic Cobalt without previous and our own. For HCP Co they are slightly different in the directions parallel and perpendicular to the c-axis. We establish the exchange stiffness scaling relation with magnetization A(m) ∼ m 1.8 valid for all sets of parameters for a wide range of temperatures. For HCP Co we find an anisotropic domain wall width in the range 24 − 29 nm which increases slowly with temperature. The results form a critical input for large-scale temperature-dependent micromagnetics simulations and demonstrate the importance of correct parameterization for accurate simulation of magnetization dynamics.

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Micromagnetic studies of cobalt microbars fabricated by nanoimprint lithography and electrodeposition

Cited by 13 publications

References 39 publications

Magnetic Configurations in Co/Cu Multilayered Nanowires: Evidence of Structural and Magnetic Interplay

Magnetic Configurations in Co/Cu Multilayered Nanowires: Evidence of Structural and Magnetic Interplay

Magnetic characterization of cobalt nanowires and square nanorings fabricated by focused electron beam induced deposition

Temperature-dependent exchange stiffness and domain wall width in Co

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