Cluster glass magnetism in the phase-separated Nd2/3Ca1/3MnO3 perovskite

Fertman, E. L.; Dolya, S. N.; Desnenko, V. A.; Beznosov, A. B.; Kajňaková, M.; Feher, A.

doi:10.1016/j.jmmm.2012.05.043

Cited by 32 publications

(18 citation statements)

References 29 publications

(31 reference statements)

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“…Magnetic behavior of the Nd 2/3 Ca 1/3 MnO 3 is consistent with a cluster-glass magnetic state below the freezing temperature T g ~ 60 K, which is close to the Curie temperature T C ~ 70 K [19].…”

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confidence: 54%

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Exchange bias associated with phase separation in the Nd2/3Ca1/3MnO3 manganite

Fertman

Dolya

Desnenko

et al. 2014

Low Temperature Physics

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The exchange bias (EB) phenomenon has been found in Nd 2/3 Ca 1/3 MnO 3 perovskite. The phenomenon manifests itself as a negative horizontal shift of magnetization hysteresis loops.The EB phenomenon is evident of an interface exchange coupling between coexisting antiferromagnetic (AFM) and ferromagnetic (FM) phases and confirms the phase separated state of the compound at low temperatures. The EB effect is found to be strongly dependent on the cooling magnetic field and the temperature, which is associated with the evolution of spontaneous AFM -FM phase separated state of the compound. Analysis of magnetic hysteresis loops has shown that ferromagnetic moment M FM originating from the FM clusters saturates in a relatively low magnetic field about H ~ 0.4 T. The obtained saturation value M FM (1 T) ~ 0.45 μ B is in a good agreement with our previous neutron diffraction data.

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confidence: 54%

“…In this paper, we report the observation of exchange bias phenomenon in spontaneously phase-separated colossal magnetoresistance compound perovskite Nd 2/3 Ca 1/3 MnO 3 , in which intrinsic phase inhomogeneity plays a crucial role [19,20]. The compound is a single phased at room temperature.…”

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confidence: 96%

Exchange bias associated with phase separation in the Nd2/3Ca1/3MnO3 manganite

Fertman

Dolya

Desnenko

et al. 2014

Low Temperature Physics

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“…Magnetic behavior of Nd 2/3 Ca 1/3 MnO 3 compound is similar to that of a cluster-glass magnetic state below the freezing temperature T g ~ 60 K, which is close to the Curie temperature T C ~ 70 K [34]. The structure and magnetic properties of the phase segregated state of this compound suggest the existence of the exchange bias effect due to the interface AFM/FM exchange coupling.…”

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confidence: 53%

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

Fertman

Dolya

Desnenko

et al. 2014

Journal of Applied Physics

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Exchange bias (EB) phenomena have been observed in Nd 2/3 Ca 1/3 MnO 3 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 Nd 2/3 Ca 1/3 MnO 3 .

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“…From the fitting shown in the inset of Fig. 7(b), the obtained values of parameter n range between 0.07 and 0.37, revealing cluster-glass rather than canonical spin-glass behavior: n < 2/3 is the fingerprint of cluster-glass formation, whereas for the so-called de Almeida-Thouless line, characteristic of spin glasses, n = 2/3 [52,55]. [56].…”

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Tuning the onset of ferromagnetism in heterogeneous bimetallic nanoparticles by gas phase doping

Bohra

Grammatikopoulos

Singh

et al. 2017

Phys. Rev. Materials

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In the nanoregime, chemical species can reorganize in ways not predicted by their equilibrium bulk behavior. Here, we engineer Ni-Cr nanoalloys at the magnetic end of their compositional range (i.e., 0-15 at. % Cr), and we investigate the effect of Cr incorporation on their structural stability and resultant magnetic ordering. To ensure their stoichiometric compositions, the nanoalloys are grown by cluster beam deposition, a method that allows one-step, chemical-free fabrication of bimetallic nanoparticles. While full Cr segregation toward nanoparticle surfaces is thermodynamically expected for low Cr concentrations, metastability occurs as the Cr dopant level increases in the form of residual Cr in the core region, yielding desirable magnetic properties in a compensatory manner. Using nudged elastic band calculations, residual Cr in the core is explained based on modifications in the local environment of individual Cr atoms. The resultant competition between ferromagnetic and antiferromagnetic ordering gives rise to a wide assortment of interesting phenomena, such as a cluster-glass ground state at very low temperatures and an increase in Curie temperature values. We emphasize the importance of obtaining the commonly elusive magnetic nanophase diagram for M-Cr (M = Fe, Co, and Ni) nanoalloys, and we propose an efficient single-parameter method of tuning the Curie temperature for various technological applications.

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Cluster glass magnetism in the phase-separated Nd2/3Ca1/3MnO3 perovskite

Cited by 32 publications

References 29 publications

Exchange bias associated with phase separation in the Nd2/3Ca1/3MnO3 manganite

Exchange bias associated with phase separation in the Nd2/3Ca1/3MnO3 manganite

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

Tuning the onset of ferromagnetism in heterogeneous bimetallic nanoparticles by gas phase doping

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