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We report detailed magnetization measurements on the perovskite oxideNdNiO$_3$. This system has a first order metal-insulator (M-I) transition atabout 200 K which is associated with charge ordering. There is also aconcurrent paramagnetic to antiferromagnetic spin ordering transition in thesystem. We show that the antiferromagnetic state of the nickel sublattice isspin canted. We also show that the concurrency of the charge ordering and spinordering transitions is seen only while warming up the system from lowtemperature. The transitions are not concurrent while cooling the systemthrough the M-I transition temperature. This is explained based on the factthat the charge ordering transition is first order while the spin orderingtransition is continuous. In the magnetically ordered state the system exhibitsZFC-FC irreversibilities, as well as history-dependent magnetization and aging.Our analysis rules out the possibility of spin-glass or superparamagnetism andsuggests that the irreversibilities originate from magnetocrystallineanisotropy and domain wall pinning.

Spin canted magnetism, decoupling of charge and spin ordering in NdNiO$_3$