scholarly journals Fabrication of Microwave Devices Based on Magnetic Nanowires Using a Laser-Assisted Process

Micromachines ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 475 ◽  
Author(s):  
Vivien Van Kerckhoven ◽  
Luc Piraux ◽  
Isabelle Huynen
Keyword(s):  
Magnetic Field ◽  
Porous Alumina ◽  
Nanowire Arrays ◽  
Microwave Devices ◽  
Substrate Integrated Waveguide ◽  
Magnetic Nanowires ◽  
Ferromagnetic Nanowires ◽  
Dc Magnetic Field ◽  
Pros And Cons ◽  
Lithography Technique

This paper compares two laser-assisted processes developed by the authors for the fabrication of microwave devices based on nanowire arrays loaded inside porous alumina templates. Pros and cons of each process are discussed in terms of accuracy, reproducibility and ease of fabrication. A comparison with lithography technique is also provided. The efficiency of the laser-assisted process is demonstrated through the realization of substrate integrated waveguide (SIW) based devices. A Nanowired SIW line is firstly presented. It operates between 8.5 and 17 GHz, corresponding to the first and second cut-off frequency of the waveguide, respectively. Next, a Nanowired SIW isolator is demonstrated. It shows a nonreciprocal isolation of 12 dB (corresponding to 4.4 dB/cm), observed in absence of a DC magnetic field, and achieved through an adequate positioning of ferromagnetic nanowires inside the waveguide cavity.

Nanowire Arrays with Specialized Geometries for Magnetoelectronics (Invited)

2004 ◽  
Vol 853 ◽  
Author(s):  
Bethanie J. H. Stadler ◽  
Na hyoung Kim ◽  
Liwen Tan ◽  
Jia Zou ◽  
Kate Kelchner ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Pore Diameter ◽  
Sensor Arrays ◽  
Nanowire Arrays ◽  
Magnetic Nanowires ◽  
Magnetic Field Sensors ◽  
Magnetoresistive Sensor ◽  
Multilayered Nanowires ◽  
Co Nanowires

This work focuses on the fabrication of magnetic nanowires with specialized geometries, such as Y-junctions, tapers and multilayers, for magnetoresistive sensor arrays. First, anodic alumina nanopores were grown with diameters of 20–250nm and lengths up to tens of microns. These pores were removed from their Al substrates and the barrier oxide was removed. Co nanowires were initially grown inside the pores by electrochemical deposition. It was shown that the coercivity and remnant magnetization could be tripled in (100)-oriented Co by shrinking the pore diameter/interpore spacing from 150/300nm to 40/80nm. These properties were further enhanced by fabricating (002)-oriented Co using the proper pH and applying a magnetic field during growth. The ability to connect two or more nanostructures is critical to the long term success of nanoelectronics and circuits. Here, Y-junctions were grown by subsequent growth of 40nm then 20nm pores such that two smaller pores extended from the bottom of each larger pore. These pores were then filled with Co in order to produce Y-junctions in the magnetic nanowires. Next, multilayered nanowires were fabricated with alternating layers of Cu and Co. The Co layer thickness was varied in order to study the affect of shape anisotropy on the magnetic properties of Co layers inside arrays. Finally, several configurations for magnetoresistive magnetic field sensors were described.

scholarly journals Nanowarming using Au-tipped Co35Fe65 ferromagnetic nanowires

Nanoscale ◽  
2019 ◽  
Vol 11 (31) ◽  
pp. 14607-14615 ◽  
Author(s):  
Daniel Shore ◽  
Adrian Ghemes ◽  
Oana Dragos-Pinzaru ◽  
Zhe Gao ◽  
Qi Shao ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Nanowires ◽  
Ferromagnetic Nanowires ◽  
Ac Magnetic Field ◽  
Warming Rate

When placed in an AC magnetic field, magnetic nanowires enable uniform nanowarming of cryopreservation agents 20× faster than the critical warming rate required to prevent devitrification.

MAGNETIC PROPERTIES OF FENI NANOWIRE ARRAYS ASSEMBLED ON POROUS AAO TEMPLATE BY AC ELECTRODEPOSITION

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2302-2307 ◽  
Author(s):  
PANGPANG WANG ◽  
LUMEI GAO ◽  
LIQUN WANG ◽  
DONGYAN ZHANG ◽  
SEN YANG ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Easy Axis ◽  
Porous Alumina ◽  
Magnetic Domain ◽  
Nanowire Arrays ◽  
Magnetic Recording Media ◽  
Alumina Template ◽  
Porous Alumina Template ◽  
Different Diameters ◽  
The Magnetic Field

FeNi nanowire arrays were fabricated into the pores of porous alumina template by a simple alternating current electrodeposition method in this work. FeNi nanowires with different diameters were obtained depending on the pore size arrangement of alumina templates. FeNi nanowire arrays exhibited obviously magnetic anisotropy, and the easy axis was along the nanowires. When the applied magnetic field was parallel to the nanowires, the coercivity (Hc) and the maximum remnant ratio (Mr/Ms) are considerable higher than those while the magnetic field perpendicular to the nanowires. FeNi nanowires prepared in this work are expected to be utilized as the perpendicular magnetic recording media. The magnetic domain structure and the magnetizing mechanism of FeNi nanowires were also been discussed.

scholarly journals Ultralow magnetostrictive flexible ferromagnetic nanowires

Nanoscale ◽  
2021 ◽  
Author(s):  
Giuseppe Muscas ◽  
Petra Jönsson ◽  
Ismael Garcia Serrano ◽  
Örjan Vallin ◽  
M. Venkata Kamalakar
Keyword(s):  
Flexible Electronics ◽  
Magnetic Nanowires ◽  
Wearable Technologies ◽  
Ferromagnetic Nanowires ◽  
Core Components

The integration of magneto-electric and spintronic sensors to flexible electronics presents massive potential for advancing flexible and wearable technologies. Magnetic nanowires are core components for building such devices. Therefore, realizing...

Effect of Magnetic Fields on the Resistance and Microstructure of Al-Cu Alloy during Solidification Processing

2011 ◽  
Vol 287-290 ◽  
pp. 2916-2920
Author(s):  
Chun Yan Ban ◽  
Peng Qian ◽  
Xu Zhang ◽  
Qi Xian Ba ◽  
Jian Zhong Cui
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Turning Points ◽  
Probe Method ◽  
Solidification Processing ◽  
Ac Magnetic Field ◽  
Dc Magnetic Field ◽  
Cu Alloy ◽  
The Difference ◽  
Good Agreement

The resistance of Al-21%Cu alloy under no magnetic field, DC magnetic field and AC magnetic field from liquid to solid was measured by a four-probe method. The difference of resistance versus temperature curves (R-T curves) was analyzed. It is found that the R-T curves of Al-21%Cu alloy are monotone decreasing and have two obvious turning points. Under DC magnetic field, the liquidus and solidus temperatures of the alloy both decrease, while under AC magnetic field, the liquidus and solidus temperatures both increase. There is a good agreement between the microstructure of quenching sample and R-T curves. The mechanism of the effect of magnetic fields was discussed.

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