Spin-locking effect in the nanoscale ordered perovskite cobaltite LaBaCo2O6
Asish K. Kundu, E. -L. Rautama, Ph. Boullay, V. Caignaert, V. Pralong,, and B. Raveau
TL;DR
This study reports a new nanoscale ordered perovskite cobaltite with unique magnetic anisotropy and high coercivity, demonstrating spin-locking effects and magnetoresistance changes at low temperatures.
Contribution
It introduces a novel nanoscale ordered LaBaCo2O6 structure with distinct magnetic properties and spin-locking behavior, not observed in previous forms.
Findings
High coercivity of 0.42 Tesla at low temperature
Strong magnetic anisotropy due to nano-domain spin locking
Maximum magnetoresistance of 6.5% at transition temperature
Abstract
A new nanoscale ordered perovskite cobaltite, which consists of 90 degree ordered domains of the layered-112 LaBaCo2O6 has been evidenced by high resolution- transmission electron microscopy. This new form, like the disordered La0.5Ba0.5CoO3 and ordered LaBaCo2O6, exhibits a ferromagnetic transition at TC around 179 K. However, it differs from the two previous forms by its strong magnetic anisotropy, and correlatively by its high value of coercivity (0.42 Tesla) at low temperature. We suggest that this behaviour originates from the locking of magnetic spins in the 90 degree oriented nano-domain. Moreover, one observes a semi-metal/semi-metal transition at TC with a maximum magnetoresistance of 6.5 % at this temperature.
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