High Saturation Magnetization Fe-Co-N Thin Film Deposited by Facing-Target Direct Current Magnetron Sputtering

Magnetic materials have long been used for signal processing structures in the microwave range. High-frequency signal processing as for band-stop or notch filters, ferromagnetic resonance frequency can be adjusted or set by magnetic properties, such as saturation magnetization Ms. In this work, Fe-Co-N thin films have been synthesized using an improved facing-target magnetron sputtering system, where the sputtering current on Co and Fe targets can be regulated independently. During deposition of Fe-Co-N thin film, parameters on Fe target followed the one for synthesis of ε-Fe3N, while changing the input current on Co target. It was found that on an unheated substrate, with the Co content of about 7 at.%, high value of Ms(265.08Am2kg-1) could be obtained in the Fe-Co-N film, which contained α"-(Fe,Co)16N2nanoparticles with the average size of 7 nm.

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Magneto-Impedance Sensor Driven by 400 MHz Logarithmic Amplifier

Micromachines ◽

10.3390/mi10060355 ◽

2019 ◽

Vol 10 (6) ◽

pp. 355 ◽

Cited By ~ 4

Author(s):

Tomoo Nakai

Keyword(s):

Thin Film ◽

High Frequency ◽

High Sensitivity ◽

Smart Manufacturing ◽

Voltage Controlled Oscillator ◽

High Frequency Signal ◽

Logarithmic Amplifier ◽

Impedance Variation ◽

Voltage Signal ◽

Impedance Sensor

A thin-film magnetic field sensor is useful for detecting foreign matters and nanoparticles included in industrial and medical products. It can detect a small piece of tool steel chipping or breakage inside the products nondestructively. An inspection of all items in the manufacturing process is desirable for the smart manufacturing system. This report provides an impressive candidate for realizing this target. A thin-film magneto-impedance sensor has an extremely high sensitivity, especially, it is driven by alternatiing current (AC) around 500 MHz. For driving the sensor in such high frequency, a special circuit is needed for detecting an impedance variation of the sensor. In this paper, a logarithmic amplifier for detecting a signal level of 400 MHz output of the sensor is proposed. The logarithmic amplifier is almost 5 mm × 5 mm size small IC-chip which is widely used in wireless devices such as cell phones for detecting high-frequency signal level. The merit of the amplifier is that it can translate hundreds of MHz signal to a direct current (DC) voltage signal which is proportional to the radio frequency (RF)signal by only one IC-chip, so that the combination of a chip Voltage Controlled Oscillator (VCO), a magneto-impedance (MI) sensor and the logarithmic amplifier can compose a simple sensor driving circuit.

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Structural and electrochemical properties of LiNi0.7Co0.15Mn0.15O2 thin film prepared by high frequency hybrid direct current and radio frequency magnetron sputtering

Journal of Electroceramics ◽

10.1007/s10832-013-9845-5 ◽

2013 ◽

Vol 31 (3-4) ◽

pp. 316-323 ◽

Cited By ~ 3

Author(s):

Youngmin Chung ◽

Ho-young Park ◽

Si-hyoung Oh ◽

Dong Young Yoon ◽

Sang-wan Jin ◽

...

Keyword(s):

Thin Film ◽

Magnetron Sputtering ◽

Radio Frequency ◽

Electrochemical Properties ◽

Direct Current ◽

High Frequency ◽

Radio Frequency Magnetron ◽

Radio Frequency Magnetron Sputtering

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Formation of thin-film HfO2/Si(100) structures by high-frequency magnetron sputtering

Russian Microelectronics ◽

10.1134/s1063739711060096 ◽

2011 ◽

Vol 40 (6) ◽

pp. 383-388 ◽

Cited By ~ 3

Author(s):

V. I. Rudakov ◽

E. A. Bogoyavlenskaya ◽

Yu. I. Denisenko ◽

V. V. Naumov

Keyword(s):

Thin Film ◽

Magnetron Sputtering ◽

High Frequency

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Simulation of Secondary Equipment Lightning Protection in EHV Substation Based on ATP

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.543-547.514 ◽

2014 ◽

Vol 543-547 ◽

pp. 514-517

Author(s):

Hong Bo Li ◽

Lin Niu ◽

Nan Nan Gao ◽

Jie Zhan ◽

Pei Li ◽

...

Keyword(s):

High Frequency ◽

Low Frequency ◽

Lightning Protection ◽

Earth System ◽

Secondary System ◽

Frequency Signal ◽

High Frequency Signal ◽

Lightning Current ◽

Grounding Grids ◽

The One

By analyzing the two lightning accidents happening to a 500kV substation situated in the lightning-prone northeastern Guangdong Province, I conclude as follows, there should be some problem in the equipotential earthing of the secondary system of this substation. Specifically, the existing potential difference in the secondary equipment gave rise to the meltdown of it which finally caused the accident. In the context,I build the one-point earthing parallel system simulation model according to ATP graphic pretreatment program, then by using slope-ramp simulation I study the lightning current which leaked into the grounding grids of the substation.In conclusion, the application of high frequency signal mixed low frequency signal earth system in the secondary system and the equipotential bonding is key to preventing accidents.

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