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Coexistence of High Magnetization and Anisotropy with Non-monotonic Particle Size Effect in Ferromagnetic PrMnO3 Nanoparticles
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2017-09-13 00:00:00 , DOI: 10.1021/acs.jpcc.7b07145
Anustup Sadhu 1 , Hemant G. Salunke 2 , Sayan Bhattacharyya 1
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2017-09-13 00:00:00 , DOI: 10.1021/acs.jpcc.7b07145
Anustup Sadhu 1 , Hemant G. Salunke 2 , Sayan Bhattacharyya 1
Affiliation
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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.
中文翻译：
铁磁PrMnO 3纳米粒子中高磁化和各向异性与非单调粒径效应的共存
稀土锰矿族中很少有高铁磁磁化强度与各向异性大并存的情况。在锰矿中，高磁化强度会降低矫顽力，反之亦然。使用非水溶胶-凝胶技术，未掺杂的PrMnO 3氧非化学计量的纳米颗粒具有出色的铁磁特性。约40 nm大小的纳米粒子在50 kOe的扫描场下的磁化强度为84 emu / g，矫顽力为885 Oe，而2μm的大块粒子的磁化强度为51 emu / g，尽管矫顽力更高，为2000 Oe。迄今为止，这些参数在颗粒大小相似的锰铁矿体系中是最高的。铁磁性相和反铁磁性相之间在颗粒核和晶界处的竞争导致了20、40和2μm颗粒之间磁性能的非单调趋势。矫顽力对低温的突然增加是由于强相互作用的纳米颗粒表面上的随机自旋冻结的结果，这也增加了磁各向异性。
更新日期：2017-09-14
中文翻译：
铁磁PrMnO 3纳米粒子中高磁化和各向异性与非单调粒径效应的共存
稀土锰矿族中很少有高铁磁磁化强度与各向异性大并存的情况。在锰矿中，高磁化强度会降低矫顽力，反之亦然。使用非水溶胶-凝胶技术，未掺杂的PrMnO 3氧非化学计量的纳米颗粒具有出色的铁磁特性。约40 nm大小的纳米粒子在50 kOe的扫描场下的磁化强度为84 emu / g，矫顽力为885 Oe，而2μm的大块粒子的磁化强度为51 emu / g，尽管矫顽力更高，为2000 Oe。迄今为止，这些参数在颗粒大小相似的锰铁矿体系中是最高的。铁磁性相和反铁磁性相之间在颗粒核和晶界处的竞争导致了20、40和2μm颗粒之间磁性能的非单调趋势。矫顽力对低温的突然增加是由于强相互作用的纳米颗粒表面上的随机自旋冻结的结果，这也增加了磁各向异性。
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