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Time-Coded GMI Magnetic Field Sensor
Xuan-Huu Cao,Derac Son 한국자기학회 2009 Journal of Magnetics Vol.14 No.3
A time-coded giant magnetoimpedance (GMI) magnetic field sensor was investigated and designed. The successfully constructed and tested laboratory model demonstrated a sensitivity of 5 ㎲/μT in the field range of ±200 μT. The sensing element in the form of an amorphous thin wire, 100 ㎜ in diameter ×50 ㎜ long, was fit into a small field modulation coil of 60 ㎜ length. At a magnetic field modulation in the range of hundreds of ㎐, the change in time interval of two adjacent GMI voltage peaks was linearly related to the external magnetic field to be measured. This mechanism improved the sensor linearity to better than 0.3% in the measuring range of ±200 μT.
GMI Magnetic Field Sensor Based on a Time-coded Principle
Xuan-Huu Cao,Derac Son 한국자기학회 2010 Journal of Magnetics Vol.15 No.4
A laboratory sensor model was designed, constructed, and tested based on a newly proposed working principle of magnetic field detection. The principle of sensing employed a time-coded method in correlation with exploiting the advantageous features of the GMI effect. The sensor demonstrated a sensitivity of 10 ㎲/μT in the field range of ±100 μT. The sensing element in the form of an amorphous thin wire, 100 ㎛ in diameter × 50 ㎜ long, was fit into a small field modulation coil of 60 ㎜ length. At a magnetic field modulation in the range of hundreds of ㎐, the change in time interval of two adjacent GMI voltage peaks was linearly related to the external magnetic field to be measured. This mechanism improved the sensor linearity of the GMI sensor to better than 0.2% in the measuring range of ±100 μT.
Magnetic Properties of Bulk Nd50Co10Fe30Al10-xVx Alloys
Hoang Duc Anh,Cao Xuan Huu,Nguyen Chau,Nguyen Hoang Luong 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
This paper presents the results of study on the structure and the properties of the bulk Nd50Co₁0Fe₃0Al₁0xVx (x = 0, 2, 4, 6, 8, 10) alloys prepared by arc-melting and suction cast- ing with water cooling. The cast surfaces of the samples are partly crystalline and the amorphous volume fraction increases with distance into cast samples. With increasing V content, the crys- tallization volume fraction increases and for x = 10, the alloy is fully crystallized. In general, the melting temperature increases, but Ms and Hc decrease with V content. The Curie temperature increases clearly from 430 K (x = 0) to 512 K (x = 10). Thermomagnetic measurements of all samples done in low elds indicate the existence of the Hopkinson effect, which shows a coherent rotation magnetization and a strong reduction of the magnetic anisotropy in partly crystallized sam- ples. The eld-cooled (FC) and the zero field-cooled (ZFC) curves measured in low elds reveal an obvious separation from each other at low temperatures, pointing to the existence of a cluster-glass state. The cluster-glass fraction decreases with increasing V content in the samples. This paper presents the results of study on the structure and the properties of the bulk Nd50Co₁0Fe₃0Al₁0xVx (x = 0, 2, 4, 6, 8, 10) alloys prepared by arc-melting and suction cast- ing with water cooling. The cast surfaces of the samples are partly crystalline and the amorphous volume fraction increases with distance into cast samples. With increasing V content, the crys- tallization volume fraction increases and for x = 10, the alloy is fully crystallized. In general, the melting temperature increases, but Ms and Hc decrease with V content. The Curie temperature increases clearly from 430 K (x = 0) to 512 K (x = 10). Thermomagnetic measurements of all samples done in low elds indicate the existence of the Hopkinson effect, which shows a coherent rotation magnetization and a strong reduction of the magnetic anisotropy in partly crystallized sam- ples. The eld-cooled (FC) and the zero field-cooled (ZFC) curves measured in low elds reveal an obvious separation from each other at low temperatures, pointing to the existence of a cluster-glass state. The cluster-glass fraction decreases with increasing V content in the samples.
( Duc Trong Quach ),( Ngoi Huu Dao ),( Minh Cao Dinh ),( Chung Huu Nguyen ),( Linh Xuan Ho ),( Nha Doan Thi Nguyen ),( Quang Dinh Le ),( Cong Minh Hong Vo ),( Sang Kim Le ),( Toru Hiyama ) 대한간학회 2016 Gut and Liver Vol.10 No.3
Background/Aims: To compare the performance of a modified Glasgow Blatchford score (mGBS) to the Glasgow Blatchford score (GBS) and the pre-endoscopic Rockall score (RS) in predicting clinical interventions in Vietnamese patients with acute nonvariceal upper gastrointestinal bleeding (ANVUGIB). Methods: A prospective multicenter cohort study was conducted in five tertiary hospitals from May 2013 to February 2014. The mGBS, GBS, and pre-endoscopic RS scores were prospectively calculated for all patients. The accuracy of mGBS was compared with that of GBS and preendoscopic RS using area under the receiver operating characteristic curve (AUC). Clinical interventions were defined as blood transfusions, endoscopic or radiological intervention, or surgery. Results: There were 395 patients including 128 (32.4%) needing endoscopic treatment, 117 (29.6%) requiring blood transfusion and two (0.5%) needing surgery. In predicting the need for clinical intervention, the mGBS (AUC, 0.707) performed as well as the GBS (AUC, 0.708; p=0.87) and outperformed the pre-endoscopic RS (AUC, 0.594; p<0.001). However, none of these scores effectively excluded the need for endoscopic intervention at a threshold of 0. Conclusions: mGBS performed as well as GBS and better than pre-endoscopic RS for predicting clinical interventions in Vietnamese patients with ANVUGIB. (Gut Liver 2016;10:375- 381)
Hoang Duc-Quang,Nguyen Thanh-Qui,Cao Xuan-Huu 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.83 No.1
Studying on the creation and propagation of magnetic domain walls in Permalloy nanowires over the past two decades has increased dramatically. Each research group has its own strengths in studying the magnetic properties of domain walls created and propagated in this soft magnetic material. Each type of approach has its own advantages and disadvantages. To understand the achievement of each research group on a particular research topic, an overview of the achievements with a technique achieved over the years for a particular research direction is needed. For that purpose, this paper summarizes some research results of establishing the phase diagrams of transverse domain walls using Lorentz transmission electron microscope. Herein, we focus on analyzing the impact of the roughness factor at the edge of the nanowires on the asymmetry of the created transverse domain walls in Permalloy nanowires. The established results are systematically analyzed and discussed. The obtained results are vital towards future applications of racetrack memory devices and magnetic logic gates.