Laser ablated pure non-crystalline Co thin films for inductors for ultra-high frequencies

2001 ◽  
Vol 674 ◽  
Author(s):  
V. Madurga ◽  
J. Vergara ◽  
C. Favieres

ABSTRACTNon-crystalline Co thin films have been prepared by pulsed laser ablation deposition. From the M-H hysteresis loops measurements, a soft magnetic behavior is observed. Néel type magnetic domain walls are observed in the as-deposited films. The spontaneous magnetization, Ms(T = 300 K), is ≍ 860 emu/cm3. After annealing at 500 oC, Ms(T = 300 K) is ≍ 1460 emu/cm3. The extrapolated to zero K resistance decreases almost two orders of magnitude from the as deposited samples to the crystallized heated at 500 °C ones. A trilayer Co/Cu/Co has shown a real part magnetic susceptibility of 120 at 100 MHz. In the 100 MHz to 1 GHz frequency range, a perpendicular bias magnetic field increased this value up to 270, remaining almost constant for all range.

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4249
Author(s):  
Cristina Favieres ◽  
José Vergara ◽  
Vicente Madurga

Charged magnetic domain walls have been visualized in soft magnetic nanostructured Fe thin films under both static and dynamic conditions. A transition in the core of these zigzagged magnetic walls from Néel-type to Bloch-type through the formation of crosstie walls has been observed. This transition in charged zigzagged walls was not previously shown experimentally in Fe thin films. For film thicknesses t < 30 nm, Néel-type cores are present, while at t ≈ 33 nm, walls with crosstie cores are observed. At t > 60 nm, Bloch-type cores are observed. Along with the visualization of these critical parameters, the dependence on the film thickness of the characteristic angle and length of the segments of the zigzagged walls has been observed and analyzed. After measuring the bistable magneto-optical behavior, the values of the wall nucleation magnetic field and the surface roughness of the films, an energetic fit to these nucleation values is presented.


1969 ◽  
Vol 2 (5) ◽  
pp. 685-690 ◽  
Author(s):  
G A Jones ◽  
B K Middleton

2017 ◽  
Vol 121 (24) ◽  
pp. 243904 ◽  
Author(s):  
Keita Ito ◽  
Nicolas Rougemaille ◽  
Stefania Pizzini ◽  
Syuta Honda ◽  
Norio Ota ◽  
...  

2012 ◽  
Vol 101 (7) ◽  
pp. 072402 ◽  
Author(s):  
D. E. Parkes ◽  
S. A. Cavill ◽  
A. T. Hindmarch ◽  
P. Wadley ◽  
F. McGee ◽  
...  

2018 ◽  
Vol 9 ◽  
pp. 1040-1049 ◽  
Author(s):  
Federico Venturi ◽  
Gian Carlo Gazzadi ◽  
Amir H Tavabi ◽  
Alberto Rota ◽  
Rafal E Dunin-Borkowski ◽  
...  

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.


2001 ◽  
Vol 90 (10) ◽  
pp. 5220-5227 ◽  
Author(s):  
Stephen McVitie ◽  
Gordon S. White ◽  
Jamie Scott ◽  
Patrick Warin ◽  
John N. Chapman

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