Exchange bias in phase-segregated Nd2/3Ca1/3MnO3 as a function of temperature and cooling magnetic fields

Abstract

Exchange bias (EB) phenomena have been observed in Nd2/3Ca1/3MnO3 colossal magnetoresistance perovskite below the Curie temperature $T_C$ = 70 K and attributed to an antiferromagnetic (AFM) - ferromagnetic (FM) spontaneous phase segregated state of this compound. Field cooled magnetic hysteresis loops exhibit shifts toward negative direction of the magnetic field axis. The values of exchange field $H_{EB}$ and coercivity $H_C$ are found to be strongly dependent of temperature and strength of the cooling magnetic field $H_{cool}$. These effects are attributed to evolution of the FM phase content and a size of FM clusters. A contribution to the total magnetization of the system due to the FM phase has been evaluated. The exchange bias effect decreases with increasing temperature up to $T_C$ and vanishes above this temperature with disappearance of FM phase. Relaxation of a non-equilibrium magnetic state of the compound manifests itself through a training effect also observed while studying EB in Nd2/3Ca1/3MnO3.

arXiv comment18 pages

References in corpus (8)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Exchange bias effect in alloys and compounds
• Intrinsic interface exchange coupling of ferromagnetic nanodomains in a charge ordered manganite
• Exchange bias and memory effect in Sr${}_2$FeCoO${}_6$
• Sign reversal in the exchange bias and the collapse of hysteresis width across the magnetic compensation temperature in a single crystal of Nd0.75Ho0.25Al2
• Lamellar phase separation and dynamic competition in La0.23Ca0.77MnO3
• Cluster glass magnetism in the phase-separated Nd2/3Ca1/3MnO3 perovskite
• Exchange bias and its phase reversal in the zero magnetization admixed rare earth intermetallics

Cited by in corpus (3)

• Anomalous coercivity enhancement with temperature and tunable exchange bias in Gd and Ti co-doped BiFeO${}_3$ multiferroics
• Large difference between the magnetic properties of Ba and Ti co-doped BiFeO${}_3$ bulk materials and their corresponding nanoparticles prepared by ultrasonication
• The effect of antisite disorder on magnetic and exchange bias properties of Gd-substituted Y${}_2$CoMnO${}_6$ double perovskite