http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
NiCo Sensing Layer for Enhanced Signals in Planar Hall Effect Sensors
Jaein Lim,Brajalal Sinha,Torati Sri Ramulu,Kun Woo Kim,Dong-Young Kim,김철기 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.4
NiCo alloy materials have been investigaged as a potential sensing layer for planar Hall effect (PHE) sensors in magnetic multilayer structures. In this study, the magnetoresistive performance of the NiCo alloy is compared with that of the NiFe alloy. With an optimum thickness of 10 nm, the increment of the PHE voltage (Vmax) for the NiCo-based sensor was approximately 1.5 times larger than that of the NiFe-based sensor. The field sensitivity of both sensor types appeared to be nearly equal. However, the dynamic field range for the NiCo sensor was increased by approximately 40% compared with that of the NiFe sensor. The measuring configuration was optimized in order to obtain higher field sensitivity in the sensor. The field sensitivity was measured to be at a maximum at a 20° angle between the easy axis of the sensor and the applied external field, which was approximately three times higher than that in the perpendicular direction.
Silica Encapsulation of Sonochemically Synthesized Iron Oxide Nanoparticles
Md. Nazrul Islam,Mohamed Abbas,Brajalal Sinha,정종율,김철기 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.6
A facile sono-chemical approach was applied for the large scale synthesis of silica coated iron oxide magnetic nanoparticles (NPs) using inexpensive and non-toxic chemicals. The as-prepared silica coated magnetic iron oxide (Fe3O4@SiO2 core-shell) NPs have been characterized by XRD, TEM, EDS, and VSM. X-ray diffraction (XRD) and EDS analysis revealed that Fe3O4 NPs have been successfully coated by this simple method. Transmission electron microscopy (TEM) data demonstrated that the thickness of silica coating on iron oxide magnetic NPs is 10 - 15 nm on average. The magnetization curve from the vibrating sample magnetometer (VSM)measurement shows that the magnetization also decreased the as-synthesized silica coated iron oxide NPs compared to the freshly prepared bare iron oxide magnetic NPs, which is also evidence of the synthesis of Fe3O4@SiO2 core-shell NPs.
Room Temperature Magnetic Detection of Spin Switching in Nanosized Spin‐Crossover Materials
Hung, Tran Quang,Terki, Ferial,Kamara, Souleymane,Dehbaoui, Mourad,Charar, Salam,Sinha, Brajalal,Kim, CheolGi,Gandit, Philippe,Gural'skiy, Il'ya A.,Molnar, Gabor,Salmon, Lionel,Shepherd, Helena J.,Bou WILEY‐VCH Verlag 2013 Angewandte Chemie Vol.125 No.4
<P><B>Ein Prototyp</B> eines SQUID‐artigen magnetometrischen Messgeräts, das Schaltvorgänge in Spin‐Crossover‐Nanopartikeln bei Raumtemperatur indirekt detektiert, wurde entwickelt und an Nanopartikeln aus [Fe(hptrz)<SUB>3</SUB>](OTs)<SUB>2</SUB> getestet (hptrz=4‐Heptyl‐1,2,4‐triazol, OTs=<I>p</I>‐Toluolsulfonyl). Der mikromagnetometrische Ansatz hat klare Vorteile gegenüber herkömmlichen SQUID‐ und Nano‐SQUID‐Techniken.</P>
Ilgyo Jeong,Young-Jae Eu,Kun Woo Kim,XingHao Hu,Brajalal Sinha,CheolGi Kim 한국자기학회 2012 Journal of Magnetics Vol.17 No.4
We have designed, fabricated and tested an integrated microfluidic chip with a Planar Hall Effect (PHE) sensor. The sensor was constructed by sequentially sputtering Ta/NiFe/Cu/NiFe/IrMn/Ta onto glass. The microfluidic channel was fabricated with poly(dimethylsiloxane) (PDMS) using soft lithography. Magnetic nanoparticles suspended in hexadecane were used as ferrofluid, of which the saturation magnetisation was 3.4 emu/cc. Droplets of ferrofluid were generated in a T-junction of a microfluidic channel after hydrophilic modification of the PDMS. The size and interval of the droplets were regulated by pressure on the ferrofluid channel inlet. The PHE sensor detected the flowing droplets of ferrofluid, as expected from simulation results. The shape of the signal was dependent on both the distance of the magnetic droplet from the sensor and the droplet length. The sensor was able to detect a magnetic moment of 2 × 10<sup>?10</sup> emu at a distance of 10 μm. This study provides an enhanced understanding of the magnetic parameters of ferrofluid in a microfluidic channel using a PHE sensor and will be used for a sample inlet module inside of integrated magnetic lab-on-a-chip systems for the analysis of biomolecules.