Exchange bias and Verwey transition in Fe5C2/Fe3O4 core/shell nanoparticles

Nanoscale ◽  
2021 ◽  
Vol 13 (37) ◽  
pp. 15837-15843
Author(s):  
M. Xing ◽  
Jeotikanta Mohapatra ◽  
J. Elkins ◽  
D. Guragain ◽  
S. R. Mishra ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Exchange Bias ◽  
Iron Carbide ◽  
Core Shell ◽  
Verwey Transition ◽  
Shell Nanoparticles ◽  
New Findings ◽  
Structural And Magnetic Properties ◽  
Core Shell Nanoparticles ◽  
Fe3o4 Core

This report presents new findings of exchange bias and related structural and magnetic properties in iron carbide/magnetite (Fe5C2/Fe3O4) core/shell nanoparticles.

scholarly journals Structural and magnetic properties of CoO-Pt core-shell nanoparticles

2014 ◽  
Vol 89 (10) ◽  
Author(s):  
Adriana Zeleňáková ◽  
Vladimir Zeleňák ◽  
Štefan Michalík ◽  
Jozef Kováč ◽  
Mark W. Meisel
Keyword(s):  
Magnetic Properties ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Structural And Magnetic Properties ◽  
Core Shell Nanoparticles

The Effects of Surface Coating on the Structural and Magnetic Properties of CoAg Core-Shell Nanoparticles

2007 ◽  
Vol 43 (6) ◽  
pp. 3106-3108 ◽  
Author(s):  
Richard Evans ◽  
Florian Dorfbauer ◽  
Oleg Myrasov ◽  
Oksana Chubykalo-Fesenko ◽  
Thomas Schrefl ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Surface Coating ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Structural And Magnetic Properties ◽  
Core Shell Nanoparticles

Structural and Magnetic Properties of CoPt@Au Core-Shell Nanoparticles Prepared Under Ambient Pressure

2011 ◽  
Vol 421 (1) ◽  
pp. 37-42
Author(s):  
T. H. Meen ◽  
H. M. Liu ◽  
C. J. Huang ◽  
T. H. Fang ◽  
L. W. Ji ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Ambient Pressure ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Structural And Magnetic Properties ◽  
Core Shell Nanoparticles

Synthesis process, size and composition effects of spherical Fe3O4 and FeO@Fe3O4 core/shell nanoparticles

2017 ◽  
Vol 41 (24) ◽  
pp. 15033-15041 ◽  
Author(s):  
Pablo Tancredi ◽  
Patricia C. Rivas Rojas ◽  
Oscar Moscoso-Londoño ◽  
Ulrike Wolff ◽  
Volker Neu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
Synthesis Process ◽  
Oxide Nanoparticles ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Synthesis Conditions ◽  
Composition Effects ◽  
Core Shell Nanoparticles ◽  
Fe3o4 Core

In this work, we study the link between synthesis conditions, crystalline structure and magnetic properties of exchange-coupled and single domain iron oxide nanoparticles

The influence of oxidation process on exchange bias in egg-shaped FeO/Fe3O4 core/shell nanoparticles

2016 ◽  
Vol 416 ◽  
pp. 269-274 ◽  
Author(s):  
Błażej Leszczyński ◽  
George C. Hadjipanayis ◽  
Ahmed A. El-Gendy ◽  
Karol Załęski ◽  
Zbigniew Śniadecki ◽  
...  
Keyword(s):  
Exchange Bias ◽  
Oxidation Process ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles ◽  
Fe3o4 Core

Structural and Magnetic Properties of Well-Ordered Inverted Core-Shell α-Cr2O3/ α-MxCr2-xO3 (M=Co, Ni, Mn, Fe) Nanoparticles

MRS Advances ◽  
2016 ◽  
Vol 1 (34) ◽  
pp. 2387-2392 ◽  
Author(s):  
M.D. Hossain ◽  
S. Dey ◽  
R. A. Mayanovic ◽  
M. Benamara
Keyword(s):  
Magnetic Properties ◽  
Oxygen Vacancy ◽  
Magnetic Measurements ◽  
Hysteresis Loops ◽  
Core Shell ◽  
Magnetic Polaron ◽  
Zero Field ◽  
Shell Nanoparticles ◽  
Structural And Magnetic Properties ◽  
Core Shell Nanoparticles

ABSTRACTMagnetic core shell nanoparticles (NPs) have potential for applications in magnetic random access memory, spintronic devices, and drug delivery systems. Our investigations are focused on the synthesis of inverted core shell nanoparticles and characterization of their structural and magnetic properties. By using our hydrothermal nanophase epitaxy technique, we are able to synthesize well-ordered α-Cr2O3@α-MxCr2-xO3 (M = Co, Ni, Mn, Fe) inverted core-shell nanoparticles. This typically results in the formation of novel phases of MxCr2-xO3 shells having ferromagnetic/ferrimagnetic (FM/FiM) spin ordering and an antiferromagnetic (AFM) Cr2O3 core structure. The combined results from XRD and high-resolution TEM (HRTEM) provide evidence of the presence of corundum phase both in the shell and in the core regions. HRTEM results also show a sharp interface exhibiting epitaxial atomic registry of shell atoms over highly ordered core atoms whereas TEM-EDX analyses show that the M atoms reside predominantly in the shell regions. The XPS analyses of the NPs indicate the M transition metals incorporated in the shell are in the +2 oxidation state. Magnetic measurements show well developed hysteresis loops: The field cooled hysteresis loops reveal horizontal shifts in the applied field axis and vertical shifts in the magnetization axis, relative to the zero-field cooled hysteresis loops. This provides direct evidence for the exchange bias effect between the AFM α-Cr2O3 core and the FM/FiM α-MxCr2-xO3 shell. The XPS data are consistent with oxygen vacancy formation in order to maintain charge neutrality upon substitution of the M2+ ion for the Cr3+ ion in the α-MxCr2-xO3 shell. The FM/FiM ordering in the shell may at least partially result from the F-center exchange coupling between the oxygen-vacancy induced bound magnetic polaron and nearby cations.

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