Magnetic Field Sensors based on Magnetoresistance Effect in Organic Semiconductor Sandwich Devices

2005 ◽  
Vol 906 ◽  
Author(s):  
Govindarajan Veeraraghavan ◽  
Ömer Mermer ◽  
Yugang Sheng ◽  
Tho Duc Nguyen ◽  
Thomas Lee Francis ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Organic Semiconductor ◽  
Room Temperature ◽  
Experimental Characterization ◽  
Magnetoresistance Effect ◽  
Temperature Dependent ◽  
Magnetic Field Sensors ◽  
Mr Effect ◽  
Alternating Magnetic Fields

AbstractWe describe magnetic field sensors based on a recently discovered magnetoresistance (MR) effect in nonmagnetic organic semiconductor sandwich devices. The MR effect reaches up to 10% in a magnetic field of 10 mT at room temperature. We perform an extensive experimental characterization of this effect. We found that the MR effect is only weakly temperature dependent and does not depend on sign and direction of the applied magnetic field. We also measured the device response to alternating magnetic fields up to 100 kHz. To the best of our knowledge, the discovered MR effect is not adequately described by any of the MR mechanisms known to date.

scholarly journals Colossal Negative Magnetoresistance Effect in a La1.37Sr1.63Mn2O7 Single Crystal Grown by Laser-Diode-Heated Floating-Zone Technique

Crystals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 547
Author(s):  
Si Wu ◽  
Yinghao Zhu ◽  
Junchao Xia ◽  
Pengfei Zhou ◽  
Haiyong Ni ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Single Crystal ◽  
Laser Diode ◽  
Room Temperature ◽  
Floating Zone ◽  
Magnetoresistance Effect ◽  
X Ray ◽  
Mr Effect ◽  
Distinct Features ◽  
The Magnetic Field

We have grown La 1.37 Sr 1.63 Mn 2 O 7 single crystals with a laser-diode-heated floating-zone furnace and studied the crystallinity, structure, and magnetoresistance (MR) effect by in-house X-ray Laue diffraction, X-ray powder diffraction, and resistance measurements. The La 1.37 Sr 1.63 Mn 2 O 7 single crystal crystallizes into a tetragonal structure with space group I4/mmm at room temperature. At 0 T, the maximum resistance centers around ∼166.9 K. Below ∼35.8 K, it displays an insulating character with an increase in resistance upon cooling. An applied magnetic field of B = 7 T strongly suppresses the resistance indicative of a negative MR effect. The minimum MR value equals −91.23% at 7 T and 128.7 K. The magnetic-field-dependent resistance shows distinct features at 1.67, 140, and 322 K, from which we calculated the corresponding MR values. At 14 T and 140 K, the colossal negative MR value is down to −94.04(5)%. We schematically fit the MR values with different models for an ideal describing of the interesting features of the MR value versus B curves.

Large Magnetoresistance at Room Temperature in Organic Semiconductor Sandwich Devices

2005 ◽  
Vol 871 ◽  
Author(s):  
Govindarajan Veeraraghavan ◽  
Omer Mermer ◽  
Thomas Lee Francis ◽  
Yugang Sheng ◽  
Tho Duc Nguyen ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Film Thickness ◽  
Organic Semiconductors ◽  
Applied Magnetic Field ◽  
Room Temperature ◽  
Electrode Materials ◽  
Bulk Material ◽  
Temperature Dependent ◽  
Semiconducting Polymer ◽  
Mr Effect

AbstractWe describe a recently discovered magnetoresistance (MR) effect in semiconducting polymer and small molecule sandwich devices. The MR effect reaches up to 10% in a magnetic field of 10mT at room temperature. This MR effect is therefore amongst the largest of any bulk material. We characterize this effect and discuss its dependence on voltage, film thickness, temperature, electrode materials and (unintentional) impurity concentration in three different organic semiconductors. We found that the MR effect is only weakly temperature dependent and does not depend on sign and direction of the applied magnetic field. To the best of our knowledge, the discovered MR effect is not adequately described by any of the mechanisms known to date.

scholarly journals Magnetic properties of cobalt microwires measured by piezoresistive cantilever magnetometry

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
G. Tosolini ◽  
J. M. Michalik ◽  
R. Córdoba ◽  
J. M. de Teresa ◽  
F. Pérez-Murano ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Room Temperature ◽  
Signal To Noise Ratio ◽  
Static Deflection ◽  
Magnetic Structures ◽  
Dual Beam ◽  
Piezoresistive Cantilevers ◽  
Good Signal ◽  
The Magnetic Field

AbstractWe present the magnetic characterization of cobalt wires grown by focused electron beam-induced deposition (FEBID) and studied using static piezoresistive cantilever magnetometry. We have used previously developed high force sensitive submicron-thick silicon piezoresistive cantilevers. High quality polycrystalline cobalt microwires have been grown by FEBID onto the free end of the cantilevers using dual beam equipment. In the presence of an external magnetic field, the magnetic cobalt wires become magnetized, which leads to the magnetic field dependent static deflection of the cantilevers. We show that the piezoresistive signal from the cantilevers, corresponding to a maximum force of about 1 nN, can be measured as a function of the applied magnetic field with a good signal to noise ratio at room temperature. The results highlight the flexibility of the FEBID technique for the growth of magnetic structures on specific substrates, in this case piezoresistive cantilevers.

scholarly journals Technical Note: Experimental characterization of the dose deposition in parallel MRI‐linacs at various magnetic field strengths

2019 ◽  
Vol 46 (11) ◽  
pp. 5152-5158
Author(s):  
Jarrad Begg ◽  
Sarah J. Alnaghy ◽  
Trent Causer ◽  
Thahabah Alharthi ◽  
Armia George ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Technical Note ◽  
Experimental Characterization ◽  
Parallel Mri ◽  
Dose Deposition ◽  
Field Strengths

Experimental characterization of temperature dependent dynamic properties of glass fiber reinforced polyurethane foams

2019 ◽  
Vol 74 ◽  
pp. 30-38 ◽  
Author(s):  
Dong-Ju Lee ◽  
Min-Kyeom Kim ◽  
Joseph Walsh ◽  
Hong-Kyu Jang ◽  
Hyung-Ick Kim ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Dynamic Properties ◽  
Polyurethane Foams ◽  
Experimental Characterization ◽  
Fiber Reinforced ◽  
Temperature Dependent ◽  
Glass Fiber Reinforced

Patterned Magnetorheological Elastomer Developed by 3D Printing

2018 ◽  
Vol 939 ◽  
pp. 147-152 ◽  
Author(s):  
Anil K. Bastola ◽  
Milan Paudel ◽  
Lin Li
Keyword(s):  
Magnetic Field ◽  
3D Printing ◽  
Magnetic Particles ◽  
Layer By Layer ◽  
Carrier Fluid ◽  
Vibration Technique ◽  
Mode Of Operation ◽  
3D Printed ◽  
Mr Effect

This article delineates the characterization of the 3D printed MR elastomer through a forced vibration technique in the squeeze mode of operation. An anisotropic hybrid magnetorheological (MR) elastomer is developed via 3D printing. The 3D printed MR elastomer consists of three different materials; magnetic particles, magnetic particles carrier fluid, and an elastomer. MR fluid filaments are encapsulated layer-by-layer within the elastomer matrix using a 3D printer. When a moderately strong magnetic field is applied, the 3D printed MR elastomer changes its elastic and damping properties. The hybrid 3D printed MR elastomer also shows an anisotropic behavior when the direction of the magnetic field is changed with respect to the orientation of the printed filaments. The relative MR effect is higher when the applied magnetic field is parallel to the orientation of the printed filaments. The maximum change in the stiffness is observed to be 65.2% when a magnetic field of 500 mT is applied to the MR elastomer system. This result shows that the new method, 3D printing could produce anisotropic hybrid MR elastomers or possibly other types.

Experimental characterization of magnetic field effects on heat transfer coefficient and pressure drop for a ferrofluid flow in a circular tube

2020 ◽  
Vol 299 ◽  
pp. 112206 ◽  
Author(s):  
Abazar Abadeh ◽  
Mohammad Sardarabadi ◽  
Mehdi Abedi ◽  
Mahdi Pourramezan ◽  
Mohammad Passandideh-Fard ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Pressure Drop ◽  
Transfer Coefficient ◽  
Circular Tube ◽  
Experimental Characterization ◽  
Magnetic Field Effects ◽  
Field Effects

Temperature-dependent current–voltage measurements of Au/C9H7N/p-Si: Characterization of a metal–organic-semiconductor device

2015 ◽  
Vol 34 ◽  
pp. 58-64 ◽  
Author(s):  
Z. Çaldıran ◽  
Ş. Aydoğan ◽  
A. Yesildag ◽  
D. Ekinci ◽  
S.V. Kurudirek ◽  
...  
Keyword(s):  
Organic Semiconductor ◽  
Semiconductor Device ◽  
Temperature Dependent ◽  
Current Voltage ◽  
Metal Organic

scholarly journals Design, Manufacture and Experimental Characterization of Magnetorheological Rotary Brake Based on an Peristaltic Pump System

2021 ◽  
Author(s):  
Tomasz Korona ◽  
Pawel Kowol ◽  
GRAZIA LO SCIUTO
Keyword(s):  
Magnetic Field ◽  
Experimental Tests ◽  
Stress And Strain ◽  
Peristaltic Pump ◽  
Experimental Characterization ◽  
Compression Force ◽  
Pump System ◽  
Concept Model ◽  
Design And Manufacture

Abstract In this article the design and manufacture of the innovative MR rotary brake based on peristaltic pump inspired by the concept model of the pliers and the Rochester Pean forceps are presented . For the calculation and analysis of created structure comprehensive of roller, housing and pliers, simulations concerning the stress and strain are conducted to investigate the deformation and possible failure of part or assembly. Experimental tests including measurements of compression force and magnetic field were conducted to evaluate the performance of proposed designed MR rotary brake based on peristaltic pump system constituted by tube containing MR fluid and pliers with arm responsible of the movement and arm completely hold on bench vise

Investigating the use of magnonic crystals as extremely sensitive magnetic field sensors at room temperature

2011 ◽  
Vol 98 (13) ◽  
pp. 132511 ◽  
Author(s):  
Mitsuteru Inoue ◽  
Alexander Baryshev ◽  
Hiroyuki Takagi ◽  
Pang Boey Lim ◽  
Kohei Hatafuku ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Room Temperature ◽  
Magnetic Field Sensors ◽  
Magnonic Crystals
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