Nanocrystalline Nickel Ferrite, NiFe2O4:  Mechanosynthesis, Nonequilibrium Cation Distribution, Canted Spin Arrangement, and Magnetic Behavior

2007 ◽  
Vol 111 (13) ◽  
pp. 5026-5033 ◽  
Author(s):  
Vladimir Šepelák ◽  
Ingo Bergmann ◽  
Armin Feldhoff ◽  
Paul Heitjans ◽  
Frank Krumeich ◽  
...  
Keyword(s):  
Cation Distribution ◽  
Nickel Ferrite ◽  
Magnetic Behavior ◽  
Nanocrystalline Nickel ◽  
Canted Spin ◽  
Spin Arrangement

Surface Effects on the Magnetic Behavior of Nanocrystalline Nickel Ferrites: The Effect of Surface Roughness and Dilution

2005 ◽  
Vol 877 ◽  
Author(s):  
H. Nathani ◽  
R.D.K. Misra ◽  
W.F. Egelhoff
Keyword(s):  
Surface Roughness ◽  
Nickel Ferrite ◽  
Magnetic Measurements ◽  
Magnetic Behavior ◽  
Magnetic Data ◽  
Zero Field ◽  
Nanocrystalline Nickel ◽  
Polyethylene Matrix ◽  
Dilution Effects ◽  
Field Cooling

AbstractThe paper describes the surface roughness and dilution effects on the magnetic behavior of nanocrystalline nickel ferrites studied by SQUID magnetometer. Two different kinds of measurements were performed: (a) zero-field cooling (ZFC) and field cooling (FC) magnetization versus temperature and (b) magnetization as a function of the applied field. The analysis of magnetic measurements indicate that while the superparamagnetic behavior is retained by nanocrystalline ferrites of different surface roughness (0.8-1.8 nm) at 300K, the hysteresis loop at 2K becomes non-squared and the coercivity increases with increase in surface roughness. This behavior is discussed in terms of broken bonds and degree of surface spin disorder. In diluted dispersion systems containing 10-40% nickel ferrite in a polyethylene matrix, the interparticle attractions continue to be dominant even when the concentration of nickel ferrite is 10 wt.% in the diluted system. The general magnetic behavior of diluted dispersion system is similar to the undiluted system; however, coercivity, remanence, and saturation magnetization are altered. These changes in the magnetic data are ascribed to magnetization interactions that encourage flux closure configuration.

Magnetic behavior of nanocrystalline nickel ferrite

2005 ◽  
Vol 121 (1-2) ◽  
pp. 126-136 ◽  
Author(s):  
H. Nathani ◽  
S. Gubbala ◽  
R.D.K. Misra
Keyword(s):  
Nickel Ferrite ◽  
Magnetic Behavior ◽  
Nanocrystalline Nickel

Nonequilibrium Cation Distribution, Canted Spin Arrangement, and Enhanced Magnetization in Nanosized MgFe2O4Prepared by a One-Step Mechanochemical Route

2006 ◽  
Vol 18 (13) ◽  
pp. 3057-3067 ◽  
Author(s):  
Vladimir Šepelák ◽  
Armin Feldhoff ◽  
Paul Heitjans ◽  
Frank Krumeich ◽  
Dirk Menzel ◽  
...  
Keyword(s):  
Cation Distribution ◽  
Canted Spin ◽  
Spin Arrangement ◽  
One Step

Nonequilibrium Cation Distribution, Canted Spin Arrangement, and Enhanced Magnetization in Nanosized MgFe2O4 Prepared by a One-Step Mechanochemical Route.

ChemInform ◽  
2006 ◽  
Vol 37 (37) ◽  
Author(s):  
Vladimir Sepelak ◽  
Armin Feldhoff ◽  
Paul Heitjans ◽  
Frank Krumeich ◽  
Dirk Menzel ◽  
...  
Keyword(s):  
Cation Distribution ◽  
Canted Spin ◽  
Spin Arrangement ◽  
One Step
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