Coexistence of High Magnetization and Anisotropy with
Non-monotonic Particle Size Effect in Ferromagnetic PrMnO3 Nanoparticles
Version 2 2017-09-13, 18:48
Version 1 2017-09-13, 18:37
Posted on 2017-09-13 - 18:48
Instances
of the coexistence of high ferromagnetic magnetization
with large anisotropy are scarce in the rare-earth manganite family.
In manganites, high magnetizations are compromised with small coercivity
and vice versa. Using nonaqueous sol–gel techniques, the undoped
PrMnO3 nanoparticles with oxygen nonstoichiometry were
rendered with exceptional ferromagnetic character. While ∼40
nm sized nanoparticles had magnetization of 84 emu/g and coercivity
of 885 Oe with 50 kOe sweeping field, the bulk 2 μm sized particles
showed a magnetization of 51 emu/g albeit with a higher coercivity
of 2000 Oe. These parameters are so far the highest among manganite
systems with similarly sized particles. The competition between the
ferromagnetic and antiferromagnetic phases both at the particle core
and at the grain boundaries resulted in a non-monotonous trend of
magnetic properties between 20, 40, and 2 μm particles. The
sudden increase of coercivity toward lower temperatures was a result
of the freezing of random spins at the surface of the strongly interacting
nanoparticles which also increased the magnetic anisotropy. These
results are of prime significance since the coexistence of such a
large magnetization with high coercivity was rarely observed in pristine
or doped manganites.
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Sadhu, Anustup; Salunke, Hemant G.; Bhattacharyya, Sayan (2017). Coexistence of High Magnetization and Anisotropy with
Non-monotonic Particle Size Effect in Ferromagnetic PrMnO3 Nanoparticles. ACS Publications. Collection. https://doi.org/10.1021/acs.jpcc.7b07145
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AUTHORS (3)
AS
Anustup Sadhu
HS
Hemant G. Salunke
SB
Sayan Bhattacharyya
KEYWORDS
magnetizationrare-earth manganite familybulk 2 μ m2000 Oeparticle coreanisotropyemucoercivity2 μ m particles50 kOegrain boundariesundoped PrMnO 3 nanoparticlesnon-monotonous trendcoexistenceNon-monotonic Particle Size Effectmanganite systemsFerromagnetic PrMnO 3 Nanoparticles Instancesoxygen nonstoichiometryHigh Magnetizationantiferromagnetic phases885 Oe