Metamagnetic behaviour and effect of field cooling on sharp magnetization jumps in multiferroic Y
                    <sub>2</sub>
                    CoMnO
                    <sub>6</sub>

Murthy, J. Krishna; Chandrasekhar, K. Devi; Hc, Wu; Yang, Hao; Lin, Jun‐You; Venimadhav, A.

doi:10.1209/0295-5075/108/27013

Cited by 38 publications

(27 citation statements)

References 35 publications

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“…However, the T C 's of all the YNMO samples are similar (88.5 K) irrespective of the preparation conditions. Both YCMO and YNMO samples show single magnetization transition in FC conditions, which are consistent with earlier reports . Multiple magnetic transitions has been observed in La 2 NiMnO 6 , La 2 CoMnO 6 , and Eu 2 CoMnO 6 .…”

Section: Resultssupporting

confidence: 91%

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Effect of Preparation Conditions on Magnetic and Dielectric Properties of Y₂MMnO₆ (M = Co, Ni)

et al. 2015

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Herein we report the structure, magnetic and dielectric properties of Y 2 CoMnO 6 (YCMO) and Y 2 NiMnO 6 (YNMO) prepared under various conditions. On annealing in inert atmosphere, YCMO sample shows a partial decomposition while YNMO remains unaffected. Both YCMO and YNMO samples show paramagnetic to ferromagnetic transition around 80 K, but only the magnetic properties of YCMO samples depend on the preparation conditions. YCMO samples show antiferromagnetic ground state in zero field and a metamagnetic transition at relatively low field (~2 T). Differences in the annealing environment do not destroy the initial antiparallel spin order in YCMO, but affect the critical fields of metamagnetic transition. The field-dependent magnetic properties indicated soft ferromagnetic nature of YNMO samples. The dielectric measurements show distinct frequency and temperature-dependent features in YCMO samples compared to YNMO samples. A large relative permittivity with e‫׳‬ of about 10 4 is observed in both O 2 and air-annealed YCMO samples. Multiple dielectric relaxations are observed in all the annealed YCMO and YNMO samples.

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Section: Resultssupporting

confidence: 91%

“…Compared to YNMO, the magnetic properties of YCMO indicated diversified behaviors, like ferromagnetic, spin glass and metamagnetic etc . Nayar et al reported that the magnetic properties of Y 2 CoMnO 6 strongly depend on the applied field .…”

Section: Introductionmentioning

confidence: 99%

Effect of Preparation Conditions on Magnetic and Dielectric Properties of Y₂MMnO₆ (M = Co, Ni)

et al. 2015

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“…The striking point is the occurrence of strong jumps in the loops. These jumps or steps were reported to depend on the field sweep rate and field-cooling conditions [14,32]. Specifically, the steps in a nominal Y 2 CoMnO 6 sample (with unknown ASD) studied in [Ref.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

“…Specifically, the steps in a nominal Y 2 CoMnO 6 sample (with unknown ASD) studied in [Ref. [32]] were attributed to the sharp transformation of E-type regions into FM ones (martensiticlike transformation). However, our neutron diffraction study precludes this scenario.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Magnetoelectric and structural properties ofY2CoMnO6: The role of antisite defects

et al. 2016

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We have carried out an investigation on the magnetoelectric properties of the presumed multiferroic Y 2 CoMnO 6 with different degrees of Co/Mn atomic ordering. The magnetic ground state was studied by neutron diffraction, showing a collinear ferromagnetic (FM) ordering of Co and Mn moments with a small antiferromagnetic canting. No superstructure peaks from an E-type magnetic structure were detected in our measurements. Magnetic measurements reveal FM transitions with pinned magnetic domains. The degree of Co/Mn ordering affects the Curie temperature only a little, but has strong effects on the magnetic hysteresis loops, and the FM moment signal at high field increases with increasing such order. The loops display steps at critical fields whose number and extent depends on each specimen. The most ordered sample exhibits the greatest steps ascribed to the alignment of magnetic domains separated by antiphase boundaries. All samples are insulators exhibiting low dielectric loss and dielectric constants at low temperature. On warming, they show a step increase in the real dielectric permittivity accompanied by peaks in the dielectric loss typical of thermally activated hopping processes. At room temperature, the huge values of the dielectric constant reveal the presence of Maxwell-Wagner depletion layers. Pyroelectric measurements reveal a high polarization at low temperature for these compounds that increases with increasing the Co/Mn ordering. There is no correlation between the magnetic transition and the onset of pyroelectric current. No significant changes are observed in the pyroelectric effect measured under an external magnetic field, so magnetoelectric coupling is negligible. This paper identifies the pyroelectric current as thermally stimulated depolarization current ascribed to the reorientation of defect dipoles with activation energy of about 0.05 eV. Therefore, no ferroelectric transition occurs in these compounds, discarding the existence of intrinsic magnetoelectric multiferroicity.

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“…A linear variation of the virgin curve magnetization with a stair-like change at 2.4 T and a no- saturation trend even up to 90 kOe are observed in the bulk ESMO polycrystalline sample; this indicates its strong AF behaviour (see SI, Figure S(3)). Further features such as irreversibility, the absence of metamagnetic beahviour for the consequent field sweeps and the virgin curve falling outside the M(H) hysteresis envelope indicate that such an isothermally field-induced magnetic phase transition is of the first-order kind 31, 35, 36 . For low doping of Sr ≤ 0.5; there are clear field induced sharp magnetization jumps for fields ≤ 50 kOe (not shown).…”

Section: Resultsmentioning

confidence: 99%

Interface-induced spontaneous positive and conventional negative exchange bias effects in bilayer La0.7Sr0.3MnO3/Eu0.45Sr0.55MnO3 heterostructures

Murthy

Kumar

2017

Sci Rep

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We report zero-field-cooled spontaneous-positive and field-cooled conventional-negative exchange bias effects in epitaxial bilayer composed of La0.7Sr0.3MnO3 (LSMO) with ferromagnetic (FM) and Eu0.45Sr0.55MnO3 (ESMO) with A-type antiferromagnetic (AF) heterostructures respectively. A temperature dependent magnetization study of LSMO/ESMO bilayers grown on SrTiO3 (001) manifest FM ordering (TC) of LSMO at ~320 K, charge/orbital ordering of ESMO at ~194 K and AF ordering (TN) of ESMO at ~150 K. The random field Ising model has demonstrated an interesting observation of inverse dependence of exchange bias effect on AF layer thickness due to the competition between FM-AF interface coupling and AF domain wall energy. The isothermally field induced unidirectional exchange anisotropy formed at the interface of FM-LSMO layer and the kinetically phase-arrested magnetic phase obtained from the metamagnetic AF-ESMO layer could be responsible for the spontaneous exchange bias effect. Importantly, no magnetic poling is needed, as necessary for the applications. The FM-AF interface exchange interaction has been ascribed to the AF coupling with (, coupling constant between AF spins) for the spontaneous positive hysteresis loop shift, and the field-cooled conventional exchange bias has been attributed to the ferromagnetically exchanged interface with (coupling constant between FM spins).

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Metamagnetic behaviour and effect of field cooling on sharp magnetization jumps in multiferroic Y ₂ CoMnO ₆

Cited by 38 publications

References 35 publications

Effect of Preparation Conditions on Magnetic and Dielectric Properties of Y₂MMnO₆ (M = Co, Ni)

Effect of Preparation Conditions on Magnetic and Dielectric Properties of Y₂MMnO₆ (M = Co, Ni)

Magnetoelectric and structural properties ofY2CoMnO6: The role of antisite defects

Interface-induced spontaneous positive and conventional negative exchange bias effects in bilayer La0.7Sr0.3MnO3/Eu0.45Sr0.55MnO3 heterostructures

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Metamagnetic behaviour and effect of field cooling on sharp magnetization jumps in multiferroic Y 2 CoMnO 6

Cited by 38 publications

References 35 publications

Effect of Preparation Conditions on Magnetic and Dielectric Properties of Y2MMnO6 (M = Co, Ni)

Effect of Preparation Conditions on Magnetic and Dielectric Properties of Y2MMnO6 (M = Co, Ni)

Magnetoelectric and structural properties ofY2CoMnO6: The role of antisite defects

Interface-induced spontaneous positive and conventional negative exchange bias effects in bilayer La0.7Sr0.3MnO3/Eu0.45Sr0.55MnO3 heterostructures

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Metamagnetic behaviour and effect of field cooling on sharp magnetization jumps in multiferroic Y ₂ CoMnO ₆

Effect of Preparation Conditions on Magnetic and Dielectric Properties of Y₂MMnO₆ (M = Co, Ni)

Effect of Preparation Conditions on Magnetic and Dielectric Properties of Y₂MMnO₆ (M = Co, Ni)