Exchange bias and spin glass states driven by antisite disorder in the double perovskite compound 
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Sahoo, R. C.; Takeuchi, Yoshinori; Ohtomo, Akira; Hossain, Zakir

doi:10.1103/physrevb.100.214436

Cited by 57 publications

(46 citation statements)

References 51 publications

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“…Although nanostructured Mn‐doped MoS 2 with a grain size of a few nanometers has shown multiple magnetic phases, [ 12 ] this possibly originates from defects or Mn‐clustering in such a disordered system, thus hindering the potential applications for magnetic refrigeration cycles and exchange bias modulation. [ 15–18 ] To the best of our knowledge, no multiple magnetic phases in 2D single crystals have been reported. In this study, we explore the magnetic properties of Mn‐doped SnS 2 single crystals with different Mn‐doping concentrations.…”

Section: Introductionmentioning

confidence: 99%

Multiple Magnetic Phases in Van Der Waals Mn‐Doped SnS₂ Semiconductor

Bouzid

Sahoo

Yun

et al. 2021

Adv Funct Materials

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2D van der Waals magnetic semiconductors have emerged along with the possibilities of achieving an efficient gate tunability and a proximity effect with a high magnetic anisotropy compared with 3D counterparts. Little explored are multiple magnetic phases with a single crystallographic phase. Herein, the multiple magnetic phases in a Mn-doped SnS 2 single crystal with different doping concentrations using a one-step self-flux method are reported. Two ferromagnetic phases with a canted spin direction exist regardless of the Mn-doping concentration at up to 5 at%. Antiferromagnetism coexists with the ferromagnetic order and strengthens at high Mn-doping concentrations. A magnetoresistance measurement conducted on a 2 at% Mn-SnS 2 flake exhibits a positive-to-negative crossover with a value of as high as 50% and clear anisotropy, confirming the presence of ferromagnetic order in the material. By revealing multiple magnetic phases in Mn-doped SnS 2 , the study broadens the scope of state-of-the-art research on layered magnetic semiconductors.

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Section: Introductionmentioning

confidence: 99%

Multiple Magnetic Phases in Van Der Waals Mn‐Doped SnS₂ Semiconductor

Bouzid

Sahoo

Yun

et al. 2021

Adv Funct Materials

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“…8. This field dependent shift in the T irr is the typical signature of the presence of spin glass (SG) or super-paramagnetic (SPM) state in these samples [33]. Thus, in order to further pinpoint this issue, we perform the field cooled thermo-remanent magnetization (TRM) measurements on the x = 0-0.4 samples at 2 K for different waiting times (t w ), with the applied magnetic field of 1000 Oe, as shown in Figs.…”

Section: Figs 7(a-c)]mentioning

confidence: 96%

“…For example, recently we investigate the spin glass behavior in the Nb substituted LaCoO 3 , where each Nb 5+ transforms two Co 3+ ions into Co 2+ [21]. However, in case of double perovskites, additional B-O-B and B -O-B exchange interactions due to disorder at the B-site results in the magnetic frustration and hence suppresses the long-range magnetic ordering, which give rise to the glassy magnetic ground states [32][33][34]. For example, a small energy difference between Co 2+ -Mn 4+ and Co 3+ -Mn 3+ states (≈0.2 eV) gives rise to the mixed valence states of Co and Mn in La 2 CoMnO 6 , which results in the cluster-glass like behavior at the low temperature due to the mixed FM and AFM interactions owing to the antisite disorder [32,35].…”

Section: Introductionmentioning

confidence: 99%

“…However, despite the presence of predominantly Co 2+ and Mn 4+ ions in its analogous compound EuMn 0.5 Co 0.5 O 3 as evident from the XAS measurements, antisite disorder results in several competing exchange interactions and hence the spin glass ground state [36]. Recently, a spin glass type ground state and exchange bias effect have been reported in disordered La 2−x Sr x CoFeO 6 compounds because multiple valence states of Co and Fe results in the competing AFM-FM exchange interactions [33,34]. However, in these compounds the presence of another magnetic Bsite cation with the Co make it difficult to understand the interesting exchange coupling between the multiple valence and the spin states of individual Co ions.…”

Section: Introductionmentioning

confidence: 99%

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Evidence of discrete energy states and cluster-glass behavior in Sr$_{2-x}$La$_x$CoNbO$_6$

Kumar,

Schwarz,

Ehrenberg

et al. 2020

Preprint

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We report the detailed analysis of specific heat [CP(T)] and ac-susceptibility for magnetically frustrated Sr2−xLaxCoNbO6 (x = 0-1) double perovskites to understand low temperature complex magnetic interactions and their evolution with x. Interestingly, the observed Schottky anomaly in the x 0.4 samples shifts gradually towards higher temperature with magnetic field as well as x, and the analysis reveal the persistence of the discrete energy states in these samples resulting from the spin-orbit coupling and octahedral distortion. Moreover, the extracted values of Landé gfactor indicate the existence of high-spin state Co 3+ ions close to non-magnetic low-spin state. The specific heat data show the λ-type anomaly for the x 0.6 samples due to evolution of the long range antiferromagnetic ordering. Our analysis of low temperature CP(T) data for the x 0.6 samples demonstrate the 3D isotropic Heisenberg antiferromagnetic (AFM) interactions and the temperature induced second order AFM-paramagnetic phase transition. More interestingly, we demonstrate the presence of the free Co 2+ like Kramers doublet ground state in the x =1 sample. Further, the ac susceptibility and time evolution of the magnetization data reveal the low temperature cluster-glass like behavior in the x = 0-0.4 samples, where spin-spin correlation strength decreases with x.

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“…More recently, the spin-orbit coupling in Ir and magnetic interactions between Co 3d and Ir 5d (spatially extended orbitals) moments have been studied along with spin-state transition between HS/LS-Co 2+ /LS-Ir 4+ to HS-Co 3+ /LS-Ir 5+ in La 2−x Sr x CoIrO 6 systems [34][35][36][37][38]. Also, the effect of small ionic mismatch between B-site cations and mixed valance states in various Co-based double pervoskites A 2 CoBO 6 (A = Sr, Ca, Ba, Y, La and B = Mn, Fe) results in exciting phenomenon like large magnetoresistance, exchange bias, spin-glass, cluster-glass, memory effect, multiferroicity, magnetocaloric, and thermoelectric effects [39][40][41][42][43][44][45], which are crucial for various device applications. The observation of half-metallicity in Sr 2 FeMoO 6 with high ferromagnetic Curie temperature has also opened the possibility of room temperature spintronics [24,46], where the knowledge of degree of disorder is important for high spin polarization.…”

Section: Introductionmentioning

confidence: 99%

Unraveling the magnetic interactions and spin state in insulating Sr$_{2-x}$La$_x$CoNbO$_6$

Kumar,

Dhaka

2020

Preprint

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We investigate the structural, magnetic and spin-state transitions, and magnetocaloric properties of Sr2−xLaxCoNbO6 (x = 0-1) double perovskites. The structural transition from tetragonal to monoclinic phase at x 0.6, and an evolution of (101)/(103) superlattice reflections and Raman active modes indicate the enhancement in the B-site ordering with x. The magnetic susceptibility data reveal the transition from weak ferromagnetic (FM) to antiferromagnetic (AFM) ordering for x 0.6 with TN≈9-15 K. Interestingly, the La substitution drives towards more insulating state due to increase in high-spin Co 2+ , whereas a spin-state crossover is observed in Co 3+ from highspin to intermediate/low-spin states with x. We discuss the correlation between complex magnetic interactions and the presence of various Co spin-states in the system. Moreover, the emergence of metamagnetic nature due to the competition between FM and AFM interactions as well as crossover from conventional to inverse magnetocaloric effect have been demonstrated by detailed analysis of temperature and field dependent change in magnetic entropy.

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Exchange bias and spin glass states driven by antisite disorder in the double perovskite compound LaSrCoFeO6

Cited by 57 publications

References 51 publications

Multiple Magnetic Phases in Van Der Waals Mn‐Doped SnS₂ Semiconductor

Multiple Magnetic Phases in Van Der Waals Mn‐Doped SnS₂ Semiconductor

Evidence of discrete energy states and cluster-glass behavior in Sr$_{2-x}$La$_x$CoNbO$_6$

Unraveling the magnetic interactions and spin state in insulating Sr$_{2-x}$La$_x$CoNbO$_6$

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Exchange bias and spin glass states driven by antisite disorder in the double perovskite compound LaSrCoFeO6

Cited by 57 publications

References 51 publications

Multiple Magnetic Phases in Van Der Waals Mn‐Doped SnS2 Semiconductor

Multiple Magnetic Phases in Van Der Waals Mn‐Doped SnS2 Semiconductor

Evidence of discrete energy states and cluster-glass behavior in Sr$_{2-x}$La$_x$CoNbO$_6$

Unraveling the magnetic interactions and spin state in insulating Sr$_{2-x}$La$_x$CoNbO$_6$

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Product

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Multiple Magnetic Phases in Van Der Waals Mn‐Doped SnS₂ Semiconductor

Multiple Magnetic Phases in Van Der Waals Mn‐Doped SnS₂ Semiconductor