Abstract
Magnetic phase coexistence in the substituted perovskite compound, La0.4Bi0.3Sr0.3MnO3, is attributed to the spontaneous moment and a step-like metamagnetic transition observed in the magnetization measurements in its magnetically order state. The magnetism of samples reduced to nanometer sizes by the “top down” approach exhibits interesting changes with respect to the bulk, thus giving a handle in influencing the physical properties by reducing the particle size. The bulk sample orders ferromagnetically at TC = 295 K, whereas in nano-sized samples with particle sizes in the range of 21–30 nm, even though TC does not change, the transitions are suppressed. The nano-sized powder samples show a broad hump in the plot of magnetic susceptibility, signifying the possible disordered antiferromagnetic state. A systematic decrease in the magnitude of magnetization in nano-sized samples shows that the reduction in magnetic interaction could be attributed to the formation of a magnetic dead layer around the magnetic core.
Highlights
Rare earth perovskite manganites are known to exhibit interesting physical properties such as charge ordering, orbital ordering, and phase separation in addition to their wellknown feature of colossal magnetoresistance (CMR) across the electrical and magnetic transition [1,2,3]
The magnetic field-induced first-order magnetic phase transition from charge-ordered antiferromagnetic phase (COAFM) to ferromagnetic metallic phase (FMM) is an interesting aspect of manganites that is vigorously pursued in the literature [4,5,6]
One of the popular ways of influencing the physical properties in manganites is by chemical substitution, which can be seen as inducing chemical pressure, substituting electrons for holes or vice versa, or creating a system where only electron count is altered to control the physical properties [12,13,14,15,16,17]
Summary
Rare earth perovskite manganites are known to exhibit interesting physical properties such as charge ordering, orbital ordering, and phase separation in addition to their wellknown feature of colossal magnetoresistance (CMR) across the electrical and magnetic transition [1,2,3]. Recent studies on the influence of particle size reduction on the physical properties of manganite nanoparticles reveal the appearance of new features such as superparamagnetism, large coercivity, and low field magnetoresistance which are different from the bulk counterpart [22,23,24]. These unique characteristics enable their potential for application in magnetic hyperthermia, photocatalysis, magnetic sensors, etc. The results of structural and magnetic property studies are presented and discussed here in the context of understanding the influence of particle size reduction on the magnetic phase coexistence in L a0.4Bi0.3Sr0.3MnO3 ( referred to as LB3SMO)
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