Single Crystal Growth of Multiferroic Double Perovskites: Yb2CoMnO6 and Lu2CoMnO6

Choi, Heekyung; Moon, Joon-Ho; Kim, Jong Hyuk; Choi, Young Jai; Lee, Nara

doi:10.3390/cryst7030067

Cited by 17 publications

(13 citation statements)

References 33 publications

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“…The dominant FIM order between Er 3+ and FM Co 2+ /Mn 4+ sublattices was identified by compensated magnetization ( M ) occurring at T Comp = 3.15 K. From our precise measurement of isothermal M in the low T regime, the inversion of the magnetic hysteresis loop was observed below T Comp , which can be explained by the delicate balance between different magnetic moments, and qualitatively by an extended Stoner–Wohlfarth model 35–38 . The ferroelectric polarization ( P ) and dielectric constant ( ε ′) measurements demonstrated an additional inclusion of the MF phase as found in Yb 2 CoMnO 6 and Lu 2 CoMnO 6 23,24 . Associated with the coexistence of FIM and MF phases, the disappearance of MF phase by an external H occurs simultaneously with the metamagnetic transition, revealing exclusive characteristics of the double perovskite.…”

Section: Introductionmentioning

confidence: 75%

“…Recently, new magnetism-driven ferroelectrics, i.e. type-II multiferroics, were found in double-perovskite Yb 2 CoMnO 6 and Lu 2 CoMnO 6 23,24 . The initial polycrystalline analysis of neutron diffraction and bulk electric properties for Lu 2 CoMnO 6 suggested that the ferroelectricity arises from the symmetric exchange striction of the ↑↑↓↓ spin chains with alternating Co 2+ and Mn 4+ charge valences 48 , consistent with the Ising spin chain magnet of Ca 3 CoMnO 6 49 .…”

Section: Resultsmentioning

confidence: 99%

“…As an extension of studies on perovskite manganites, double perovskites of R2CoMnO6 (R = La, …, Lu, and Y) have recently been explored owing to their fascinating magnetic and functional properties, such as metamagnetism [11][12][13] , spin-glass state [14][15][16] , exchange bias effect [17][18][19] , magnetocaloric effect [20][21][22] , and multiferrocity [23][24][25][26][27] . By replacing half the Mn ions with Co ions in perovskite manganites, a double perovskite structure is formed with Co 2+ (S = 3/2) and Mn 4+ (S = 3/2) ions, alternatingly located in corner-shared octahedral environments.…”

Section: Introductionmentioning

confidence: 99%

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Strong magnetoelectric coupling in mixed ferrimagnetic-multiferroic phases of a double perovskite

Kim

Moon

et al. 2019

Sci Rep

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Exploring new magnetic materials is essential for finding advantageous functional properties such as magnetoresistance, magnetocaloric effect, spintronic functionality, and multiferroicity. Versatile classes of double perovskite compounds have been recently investigated because of intriguing physical properties arising from the proper combination of several magnetic ions. In this study, it is observed that the dominant ferrimagnetic phase is coexisted with a minor multiferroic phase in single-crystalline double-perovskite Er 2 CoMnO 6 . The majority portion of the ferrimagnetic order is activated by the long-range order of Er 3+ moments below T Er = 10 K in addition to the ferromagnetic order of Co 2+ and Mn 4+ moments arising at T C = 67 K, characterized by compensated magnetization at T Comp = 3.15 K. The inverted magnetic hysteresis loop observed below T Comp can be described by an extended Stoner–Wohlfarth model. The additional multiferroic phase is identified by the ferroelectric polarization of ~0.9 μC/m 2 at 2 K. The coexisting ferrimagnetic and multiferroic phases appear to be strongly correlated in that metamagnetic and ferroelectric transitions occur simultaneously. The results based on intricate magnetic correlations and phases in Er 2 CoMnO 6 enrich fundamental and applied research on magnetic materials through the scope of distinct magnetic characteristics in double perovskites.

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Section: Introductionmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Strong magnetoelectric coupling in mixed ferrimagnetic-multiferroic phases of a double perovskite

Kim

Moon

et al. 2019

Sci Rep

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“…Recently, double‐perovskite R 2 CoMnO 6 (R = La, …, Lu) compounds have been studied due to their fascinating functional properties like magnetocaloric effect, exchange bias effect, and multiferroicity, arising from intricate magnetic phases and interactions. In these compounds, the incomplete exchange between Co 2+ and Mn 4+ ions naturally engenders anti‐sites of ionic disorders and/or antiphase boundaries.…”

mentioning

confidence: 99%

“…The formation of the additional AFM clusters by the anti‐sites is the known reason for the observed magnetic exchange bias in polycrystalline Y 2 CoMnO 6 . Yb 2 CoMnO 6 and Lu 2 CoMnO 6 present multiferroicity due to the cooperative O 2− displacements through symmetric exchange strictions in the up‐up‐down‐down (↑↑↓↓) spin configuration . Thus, comprehensive investigation of ionic orders and versatile magnetic interactions is crucial for understanding the intrinsic characteristics in double perovskites.…”

mentioning

confidence: 99%

Enhanced Exchange Bias Effect by Modulating Relative Ratio of Magnetic Ions in Y₂Co_2−xMn_xO₆ (x = 1.0–1.9)

Moon

et al. 2019

Physica Rapid Research Ltrs

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It has recently been reported that the exchange bias (EB) phenomenon in double-perovskite Y 2 CoMnO 6 ceramic arises from additional antiferromagnetic (AFM) clusters formed by the anti-sites of ionic disorders in the dominant ferromagnetic (FM) phase. To extensively examine the role of ionic orders and versatile magnetic interactions, we measure the magnetic properties of Y 2 Co 2 À x Mn x O 6 (x ¼ 1.0-1.9) compounds with different relative ratios of the magnetic ions. Upon increasing the ratio of Mn ions, the FM transition temperature is gradually lowered with a greatly enhanced EB effect for x ! 1.4. The measurement of heat capacity and AC magnetic susceptibility in the compound with x ¼ 1.5 suggests the formation of magnetic cluster-glass state from short-range FM order with comparable AFM clusters generated by the formation of Mn 3þ -O 2À -Mn 3þ bonds. The dependence of the EB effect on the cooling field reveals the maximum EB field at 2 K to be H EB ¼ 3.19 kOe. The large EB effect originates from the adjusted proportions of FM and AFM phases and the improved interfacial pinning of exchange coupling in the cluster-glass state. Our results, based on intricate magnetic correlations and phases, provide essential clues for exploring suitable ceramic compounds for magnetic functional applications.Magnetic devices having composite stacking geometry of different magnetic phases often display exchange bias (EB) effect, which is essential for manipulating magnetic hardness, such as attaining a pinned state of the read head for recording devices and a fixed reference layer for a spin valve as the basis of magnetic random-access memories. [1][2][3][4][5] The EB effect is associated with interfacial exchange interactions between ferromagnetic (FM) and antiferromagnetic (AFM) phases. [6][7][8][9][10] It occurs typically in thin film bilayers, reflected in the unidirectional anisotropy of the AFM layer coupled with interfacial magnetic moments of the FM layer upon cooling to the N eel temperature in an applied magnetic field. [11][12][13][14] Intensive studies of EB effect on core-shell nanostructures have been conducted to find efficient means for nanoscale miniaturization of magnetic devices. [8,[15][16][17][18] Many efforts have been made to realize the EB effect on bulk ceramic materials by taking advantage of a simple synthesis procedure. However, the bulk materials rarely reveal magnetic phase separation along with the desired magnetic anisotropy and hardness in each phase to demonstrate the EB effect. Many reports on bulk ceramics have stated that the EB effects originate from the formation of magnetic cluster-glass composed of interfaces between different magnetic states. [7,[19][20][21][22] Recently, double-perovskite R 2 CoMnO 6 (R ¼ La, . . ., Lu) compounds have been studied due to their fascinating functional properties like magnetocaloric effect, [23] exchange bias effect, [24] and multiferroicity, [25,26] arising from intricate magnetic phases and interactions. In these compounds, the incomplete exchange betw...

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Maxwell–Wagner Polarization and Mixed Ferromagnetic and Antiferromagnetic State in Eu₂CoMnO₆

Alam,

Kumar,

Kumar

et al. 2023

Physica Status Solidi (b)

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Herein, the electrical and magnetic properties of polycrystalline Eu2CoMnO6 are explored. More specifically, based on transport, dielectric, and impedance measurements, a thermally activated dielectric polarization near room temperature is reported. The valence states of transition metals in the Eu2CoMnO6 sample are studied by measuring the X‐ray absorption spectra at both Co‐L2,3 and Mn‐L2,3 edges. Moreover, based on magnetization, X‐ray absorption spectroscopy, and X‐ray magnetic circular dichroism measurements, the coexistence of competing ferromagnetic and antiferromagnetic phases is probed. Dielectric measurement shows a large dielectric constant near room temperature along with a large frequency dispersion. The temperature‐dependent resistivity, Cole–Cole plot, and imaginary part of impedance confirm the semiconducting nature of Eu2CoMnO6. Temperature‐dependent magnetization shows a second‐order magnetic transition below 125 K. Isothermal magnetization versus magnetic field loop shows first‐order metamagnetic transition, driven by mixed magnetic state owing to the presence of antisite disorder and antiphase boundary.

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Single Crystal Growth of Multiferroic Double Perovskites: Yb2CoMnO6 and Lu2CoMnO6

Cited by 17 publications

References 33 publications

Strong magnetoelectric coupling in mixed ferrimagnetic-multiferroic phases of a double perovskite

Strong magnetoelectric coupling in mixed ferrimagnetic-multiferroic phases of a double perovskite

Enhanced Exchange Bias Effect by Modulating Relative Ratio of Magnetic Ions in Y₂Co_2−xMn_xO₆ (x = 1.0–1.9)

Maxwell–Wagner Polarization and Mixed Ferromagnetic and Antiferromagnetic State in Eu₂CoMnO₆

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Single Crystal Growth of Multiferroic Double Perovskites: Yb2CoMnO6 and Lu2CoMnO6

Cited by 17 publications

References 33 publications

Strong magnetoelectric coupling in mixed ferrimagnetic-multiferroic phases of a double perovskite

Strong magnetoelectric coupling in mixed ferrimagnetic-multiferroic phases of a double perovskite

Enhanced Exchange Bias Effect by Modulating Relative Ratio of Magnetic Ions in Y2Co2−xMnxO6 (x = 1.0–1.9)

Maxwell–Wagner Polarization and Mixed Ferromagnetic and Antiferromagnetic State in Eu2CoMnO6

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Enhanced Exchange Bias Effect by Modulating Relative Ratio of Magnetic Ions in Y₂Co_2−xMn_xO₆ (x = 1.0–1.9)

Maxwell–Wagner Polarization and Mixed Ferromagnetic and Antiferromagnetic State in Eu₂CoMnO₆