Mn-Bi Magnetic Powders With High Coercivity and Magnetization at Room Temperature

2012 ◽  
Vol 48 (11) ◽  
pp. 3641-3643 ◽  
Author(s):  
Chins Chinnasamy ◽  
Melania M. Jasinski ◽  
Aaron Ulmer ◽  
Wanfeng Li ◽  
George Hadjipanayis ◽  
...  
Keyword(s):  
Room Temperature ◽  
High Coercivity

Assessment of Magnetic Properties between Fe and Ni Doped ZnO Nanoparticles Synthesized by Microwave Assisted Synthesis Method

2021 ◽  
Vol 317 ◽  
pp. 119-124
Author(s):  
Sabiu Said Abdullahi ◽  
Garba Shehu Musa Galadanci ◽  
Norlaily Mohd Saiden ◽  
Josephine Ying Chyi Liew
Keyword(s):  
Magnetic Properties ◽  
Zno Nanoparticles ◽  
Room Temperature ◽  
Synthesis Method ◽  
Dilute Magnetic Semiconductors ◽  
High Coercivity ◽  
Microwave Assisted Synthesis ◽  
Ferromagnetic Behavior ◽  
Microwave Assisted ◽  
Doped Zno

The emergence of Dilute Magnetic Semiconductors (DMS) with a potentials for spintronic application have attracted much researches attention, special consideration has been given to ZnO semiconductor material due to its wide band gap of 3.37 eV, large exciting binding energy of 60 meV, moreover, its ferromagnetic behavior at room temperature when doped with transition metals. MxZn1-xO (M = Fe or Ni) nanoparticles were synthesized by microwave assisted synthesis method calcined at 600°C. The structural, morphological and magnetic properties of these nanoparticles were studied using X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM) and Vibrating Sample Magnetometer (VSM) respectively. Single phase Wurtzite hexagonal crystal structure was observed for the undoped and Fe doped ZnO nanoparticles with no any impurity, whereas Ni doped ZnO nanoparticles shows the formation of NiO impurities. The magnetic measurement reveals a diamagnetic behavior for the undoped ZnO meanwhile a clear room temperature ferromagnetism was observed for both Fe and Ni doped ZnO. Fe doped ZnO present a high saturation magnetization compared to Ni doped ZnO. However, Ni doped ZnO present high coercivity. The research was confirmed that Fe doped ZnO material will be good material combination for spintronic applications.

High Coercivity of Oleic Acid Capped CoFe2O4Nanoparticles at Room Temperature

2009 ◽  
Vol 113 (27) ◽  
pp. 9070-9076 ◽  
Author(s):  
Mukta V. Limaye ◽  
Shashi B. Singh ◽  
Sadgopal K. Date ◽  
Deepti Kothari ◽  
V. Raghavendra Reddy ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Room Temperature ◽  
High Coercivity

scholarly journals Magnetic Properties of FePt Nanoparticles Prepared by Sonoelectrodeposition

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
Nguyen Hoang Nam ◽  
Nguyen Thi Thanh Van ◽  
Nguyen Dang Phu ◽  
Tran Thi Hong ◽  
Nguyen Hoang Hai ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Metallic Nanoparticles ◽  
Room Temperature ◽  
Cathode Surface ◽  
High Coercivity ◽  
Fept Nanoparticles ◽  
Promising Technique ◽  
Structural And Magnetic Properties

Sonoelectrodeposition is a useful technique to make metallic nanoparticles, using ultrasound during electrodeposition to remove nanoparticles as they grow on the cathode surface. This paper reports some structural and magnetic properties of FePt nanoparticles prepared by this method. The as-prepared Fe45Pt55nanoparticles were ferromagnetic at room temperature. Upon annealing at 700°C for 1 h under H2atmosphere, the saturation magnetization and the coercivity of the nanoparticles were improved significantly. The annealed nanoparticles showed a high coercivity of 13.5 kOe at 2 K and of 9 kOe at room temperature. Sonoelectrodeposition is a promising technique to make large quantity of FePt nanoparticles.

Holmium induced enhanced functionality at room temperature and structural phase transition at high temperature in bismuth ferrite nanoparticles

2016 ◽  
Vol 4 (4) ◽  
pp. 780-792 ◽  
Author(s):  
Smita Chaturvedi ◽  
Rabindranath Bag ◽  
Vasant Sathe ◽  
Sulabha Kulkarni ◽  
Surjeet Singh
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
High Temperatures ◽  
Structural Phase Transition ◽  
Room Temperature ◽  
Bismuth Ferrite ◽  
Structural Phase ◽  
Ferrite Nanoparticles ◽  
High Coercivity ◽  
Remnant Magnetization

Ho-doped sample simultaneously exhibits high-coercivity and enhanced remnant magnetization with a polar R3c symmetry at room temperature. The onset of R3c to Pnma phase transition is observed at high temperatures in the Ho-doped samples.

Growth dominant co-precipitation process to achieve high coercivity at room temperature in CoFe/sub 2/O/sub 4/ nanoparticles

2002 ◽  
Vol 38 (5) ◽  
pp. 2640-2642 ◽  
Author(s):  
C.N. Chinnasamy ◽  
B. Jeyadevan ◽  
O. Perales-Perez ◽  
K. Shinoda ◽  
K. Tohji ◽  
...  
Keyword(s):  
Room Temperature ◽  
High Coercivity ◽  
Precipitation Process ◽  
Co Precipitation

scholarly journals Auxiliary Aqueous Solution Processes for the Synthesis of Cobalt Ferrit with High Coercivity at Room Temperature.

2003 ◽  
Vol 50 (2) ◽  
pp. 114-119 ◽  
Author(s):  
Balachandran Jeyadevan ◽  
Chinnaperuma Gaunden Puddhur Nallas ◽  
Oscar Perales Perez ◽  
Kozo Shinoda ◽  
Kazuyuki Tohji ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Room Temperature ◽  
High Coercivity ◽  
Solution Processes

Mild synthesis of CoFe2O4 nanowires using carbon nanotube template: a high-coercivity material at room temperature

2004 ◽  
Vol 272-276 ◽  
pp. 1642-1644 ◽  
Author(s):  
N Keller ◽  
C Pham-Huu ◽  
T Shiga ◽  
C Estournès ◽  
J.-M Grenèche ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Room Temperature ◽  
High Coercivity

A study on barium ferrite particles prepared by chemical coprecipitation

2000 ◽  
Vol 15 (10) ◽  
pp. 2151-2156 ◽  
Author(s):  
W. K. Ng ◽  
J. Ding ◽  
Y. Y. Chow ◽  
S. Wang ◽  
Y. Shi
Keyword(s):  
Heat Treatment ◽  
Barium Ferrite ◽  
Room Temperature ◽  
Fine Particles ◽  
High Coercivity ◽  
Weak Anisotropy ◽  
Chemical Coprecipitation ◽  
Dispersed Particles ◽  
Dispersing Agent ◽  
Different Temperatures

Chemical coprecipitation was employed to prepare fine particles of barium ferrite with high coercivity (450 kA/m). Magnetic properties of the bonded barium ferrite magnet were measured at different temperatures. The results were found to be fairly close to the theoretical values based on the Stoner–Wohlfarth model. Mechanical milling was utilized to prepare ultrafine dispersed barium ferrite particles. NaF was introduced as a dispersing agent during milling and subsequent heat treatment. The dispersed particles were compacted and then subjected to die upsetting at room temperature. A weak anisotropy in the coercivity and remanence was found in the directions parallel and perpendicular to the compaction direction.

Unusually high coercivity at room temperature in CoFe/sub 2/O/sub 4/ nanoparticles

2003 ◽  
Author(s):  
C.N. Chinnasamy ◽  
B. Jeyadevan ◽  
O. Perales-Perez ◽  
K. Tohji ◽  
K. Shinoda ◽  
...  
Keyword(s):  
Room Temperature ◽  
High Coercivity
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