Field-Induced Reentrant Novel Phase and a Ferroelectric-Magnetic Order Coupling in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow><mml:mi mathvariant="normal">H</mml:mi><mml:mi mathvariant="normal">o</mml:mi><mml:mi mathvariant="normal">M</mml:mi><mml:mi mathvariant="normal">n</mml:mi><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:math>

Lorenz, B.; Litvinchuk, A. P.; Gospodinov, M.; Chu, C. W.

doi:10.1103/physrevlett.92.087204

Cited by 203 publications

(170 citation statements)

References 15 publications

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“…24 The application of electric or magnetic field will induce movement of domain walls that would cost energy. 31 This is the reason for decrease in magnitude of dielectric constant (ε) and loss (tanδ) after the application of magnetic field. In strained ferromagnetic films, the variation of Curie temperature has been attributed to change in the bond lengths and bond angles of Mn-O octahedral and splitting of e g levels.…”

Section: IIImentioning

confidence: 99%

Effect of epitaxial strain on the magneto-electric coupling of YMnO3 thin films

Singh

Snure

Tiwari

et al. 2009

Journal of Applied Physics

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We report synthesis of phase pure multiferroic YMnO 3 thin films on sapphire (0001) with conducting ZnGaO buffer contact layer. Films were prepared by using pulsed laser deposition technique and characterized using x-ray diffraction (XRD), Scanning electron microscopy (SEM), Energy dispersive absorption spectroscopy (EDAX) and magnetic field dependent dielectric measurement techniques. Structural characterizations indicated phase purity and epitaxial nature of the films. The dielectric response indicated an anomaly in dielectric constant ε and tanδ in the vicinity of 30 K, well below the bulk Néel temperature ~ 70 K. This anomaly in ε (T) and tanδ and its magnetic field dependence is explained as an influence of strain due to lattice mismatch between the substrate and YMnO 3 film. A substantial enhancement in magnetocapacitance was also observed for magnetic field applied parallel to ab plane of the film. Our results show that it is possible to tune the multiferroic property of YMnO 3 via changes in ferroelastic route.2

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Section: IIImentioning

confidence: 99%

Effect of epitaxial strain on the magneto-electric coupling of YMnO3 thin films

Singh

Snure

Tiwari

et al. 2009

Journal of Applied Physics

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“…5 Our particular interest in R-IGs follows the mainstream of the modern studies of magnetoelectric and multiferroic materials. 6,7,8,9,10 The microscopic nature of the magnetoelectric effects can be better understood through the studies of the optical excitations such as IR active electromagnons and lattice vibrations that are modified by the spin-lattice interaction. 11,12,13,14,15,16,17,18,19 Due to the coincidence of the temperatures for the FM ordering of Dy spins and the AFE lattice ordering in Dy-IG, we expected an interesting behavior for the low-frequency optical phonons, which are related to the displacements of the heaviest ions (Dy) and spin-related ligand field (LF) transitions and Kaplan-Kittel (KK) 20 magnetic exchange resonance modes in Dy-IG.…”

Section: Introductionmentioning

confidence: 99%

Far-infrared spectra of the magnetic exchange resonances and optical phonons and their connection to magnetic and dielectric properties of Dy3Fe5O
Kang
¹
,
Standard
²
,
Rogers
³

et al. 2012
Phys. Rev. B
17
1
5
0
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Far-infrared spectra of ferrimagnetic Dy 3 Fe 5 O 12 single crystals have been studied in the spectral range between 12 and 700 cm -1 and in a wide temperature range between 5 K and 300 K using transmission spectroscopy and rotating analyzer ellipsometry. In the temperature range below T C =16 K for the magnetic ordering of Dy 3+ spins, a number of ligand field (LF) and Kaplan-Kittel (KK) exchange resonance modes have been found. Temperature dependences of their frequencies allowed us to estimate the ratio between the Fe−Dy and Dy−Dy exchange constants.We found that variation of the oscillator strength of the KK modes correlates with the magnetic field induced changes of magnetic permeability. The low temperature peak in the static value of the dielectric function at T C =16 K may be related to the observed temperature-induced variation of the oscillator strength of the optical phonons.

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“…16 In rare cases the f-d exchange can result in an in-plane rotation of the d spins as observed in hexagonal HoMnO 3 . 19 Dielectric anomalies associated with spin reorientation transitions have been observed in several manganites, 7,20 and the significance of the spin-lattice coupling and magnetoelastic effects has been shown. 11 The coupling between the f and d spins forming a 90°angle can be mediated by the antisymmetric Dzyaloshinskii-Moriya interaction ͑which is proportional to the vector product of f and d moments and gives rise to weak ferromagnetism͒, or by a pseudodipolar interaction arising from the anisotropy of the f-d exchange.…”

mentioning

confidence: 99%

Magnetic field effect and dielectric anomalies at the spin reorientation phase transition ofGdFe3(BO3)4

et al. 2006

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GdFe 3 ͑BO 3 ͒ 4 exhibits a structural phase transition at 156 K, antiferromagnetic order of the Fe 3+ moments at 36 K, followed by a spin reorientation phase transition at 9 K. The reorientation phase transition is studied through dielectric, magnetic, and heat capacity measurements under the application of external magnetic fields of up to 7 kOe. The dielectric constant indicates the existence of two distinct anomalies at T SR = 9 K that separate in temperature under external magnetic fields. The spin rotation phase transition is proven to be of the first-order nature through the magnetic analog of the Clausius-Clapeyron equation. Magnetodielectric effect of up to 1% is observed at 8 K and 7 kOe. The uniaxial magnetocaloric effect along the c axis is observed below the spin reorientation phase transition of 9 K. GdFe 3 ͑BO 3 ͒ 4 belongs to the trigonal system with space group R32. It is similar to huntite CaMg 3 ͑CO 3 ͒ 4 , a trigonal trapezohedral structure that is one of the five trigonal types. Borate crystals of this category are appealing because of their possible applications as single crystal minilasers due to their good luminescent and nonlinear optical properties. In particular for GdFe 3 ͑BO 3 ͒ 4 single crystals, recent studies have focused on the better understanding of its optical properties, and at the same time on its magnetic properties through phase matching of absorption and second harmonic generation spectra. 1,2 The magnetic properties of the rareearth iron borates are also of fundamental interest because of the existence and mutual interference of two magnetic subsystems ͑Fe and Gd͒. The understanding of the magnetic orders of the gadolinium and iron sublattices, and the coupling between the iron spins and the gadolinium moments that contributes to the crystal's rich magnetic properties is of fundamental importance.The crystal structure of huntite has been analyzed and described elsewhere, 3-5 it consists of GdO 6 bipyramids and FeO 6 octahedrons. The octahedrons form threefold helicoidal chains along the c axis. The bipyramids are located between three nearly equal distant octahedrons. Rare-earth iron borates, RFe 3 ͑BO 3 ͒ 4 ͑R =Eu to Ho, and Y͒, undergo a structural transition at higher temperatures and an antiferromagnetic ͑AFM͒ transition involving the Fe spins at T N Ϸ 35 K. 6 For R = Gd a weakly first-order structural phase transition at T 1 = 156 K changes the structural symmetry from R32 to P3 1 2 1 . 5 A second-order phase transition at T N = 36 K results in the AFM ordering of the Fe 3+ magnetic moments aligned in the basal plane. At T SR = 9 K, another sharp phase transition occurs characterized by a spin reorientation of the Fe 3+ magnetic moments by 90°from the basal plane to the c axis.The coupling between the Gd moments and the Fe spins at low temperatures is strong in GdFe 3 ͑BO 3 ͒ 4 and it was speculated that the reorientation of the AFM iron spin system is triggered by the anisotropy of the Gd moments aligned with the c axis. 6 This exchange interaction is indirect and ...

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Field-Induced Reentrant Novel Phase and a Ferroelectric-Magnetic Order Coupling inHoMnO3

Cited by 203 publications

References 15 publications

Effect of epitaxial strain on the magneto-electric coupling of YMnO3 thin films

Effect of epitaxial strain on the magneto-electric coupling of YMnO3 thin films

Far-infrared spectra of the magnetic exchange resonances and optical phonons and their connection to magnetic and dielectric properties of Dy3Fe5O
Kang
¹
,
Standard
²
,
Rogers
³

et al. 2012
Phys. Rev. B
17
1
5
0
View full text Add to dashboard Cite

Magnetic field effect and dielectric anomalies at the spin reorientation phase transition ofGdFe3(BO3)4

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Field-Induced Reentrant Novel Phase and a Ferroelectric-Magnetic Order Coupling inHoMnO3

Cited by 203 publications

References 15 publications

Effect of epitaxial strain on the magneto-electric coupling of YMnO3 thin films

Effect of epitaxial strain on the magneto-electric coupling of YMnO3 thin films

Far-infrared spectra of the magnetic exchange resonances and optical phonons and their connection to magnetic and dielectric properties of Dy3Fe5OKang1, Standard2, Rogers3 et al. 2012Phys. Rev. B17150View full textAdd to dashboardCite

Magnetic field effect and dielectric anomalies at the spin reorientation phase transition ofGdFe3(BO3)4

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Far-infrared spectra of the magnetic exchange resonances and optical phonons and their connection to magnetic and dielectric properties of Dy3Fe5O
Kang
¹
,
Standard
²
,
Rogers
³

et al. 2012
Phys. Rev. B
17
1
5
0
View full text Add to dashboard Cite