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Hur, N.; Park, S.; Sharma, Peter Anand; Guha, Saikat; Cheong, Sang‐Wook

doi:10.1103/physrevlett.93.107207

Cited by 364 publications

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“…5,6 Large effects of an a-axis magnetic field on the dielectric constant 7 and the FE polarization 6 have been reported. Upon decreasing temperature T the sequence of phase transitions is similar for most RMn 2 O 5 .…”

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“…The c axis of DyMn 2 O 5 is the hard magnetic axis 7 and the magnetic phase diagram for H c has not been investigated yet. The magnetostriction measurements along c reveal a more complex phase diagram as compared to the a-and b-axis fields.…”

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“…7 The longitudinal magnetostriction measurements were conducted along the three crystallographic orientations in an Oxford variable temperature cryostat with a superconducting magnet up to 14 T employing a highprecision capacitance dilatometer. 4 Complimentary measure- ments of the b-axis dielectric constant in magnetic field have been conducted to correlate the observed field-induced lattice anomalies with the dielectric properties and the known phase transitions.…”

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Magnetoelastic effects and the magnetic phase diagram of multiferroicDyMn2O5

et al. 2006

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The magnetoelastic coupling in multiferroic DyMn 2 O 5 is investigated by magnetostriction measurements along the three crystallographic orientations. Strong lattice anomalies as a function of the magnetic field are detected at the low temperature magnetic and ferroelectric phase transitions. The sign and magnitude of the magnetostrictive coefficient as well as the lattice anomalies at the transitions are correlated with the Dy moment order and with the sharp changes of the dielectric constant and the ferroelectric polarization. With the magnetic field applied along the c axis a high-field phase has been detected the magnetic structure of which has yet to be explored. DOI: 10.1103/PhysRevB.74.180402 PACS number͑s͒: 75.25.ϩz, 75.30.Kz, 75.80.ϩq, 77.80.Ϫe Among the multiferroic materials displaying the coexistence of magnetic and ferroelectric ͑FE͒ orders the rare earth manganites RMn 2 O 5 ͑R = rare earth, Y͒, have attracted attention because of a wealth of fundamental physical phenomena observed in these compounds. Incommensurate magnetic orders, spin frustration, lock-in transitions, and ferroelectricity have been detected with decreasing temperature and give rise to a cascade of phase transitions. 1 The physical origin of this phase complexity lies in the partially competing interactions between the Mn 4+ /Mn 3+ spins, the rare earth magnetic moments, and the lattice. 2 Geometric magnetic frustration among the Mn 3+ −Mn 4+ spins leads to a ground state degeneracy of the magnetic states that can be lifted by a distortion of the lattice ͑magnetic Jahn-Teller effect͒. This is believed to be the origin of ferroelectricity in RMn 2 O 5 compounds. [2][3][4] Strong spin-lattice coupling is needed to explain the ionic displacements in the FE state. The experimental proof of sizable lattice anomalies at the FE transitions in RMn 2 O 5 was given recently by thermal expansion experiments in zero magnetic field. 4 However, the effect of an external magnetic field on the lattice of RMn 2 O 5 has not been investigated yet. The field couples to the magnetic order resulting in fieldinduced spin reorientations and magnetic phase transitions 5 which, in turn, should affect the lattice via the spin-lattice interaction. The signature and the nature of the magnetoelastic effect provides essential information about the intrinsic magnetoelastic and magnetoelectric interactions. We have therefore investigated the magnetoelastic strain on the lattice of DyMn 2 O 5 and found large changes of the lattice parameters as a function of the magnetic field and abrupt striction effects at phase boundaries.DyMn 2 O 5 exhibits a complex magnetic phase diagram. 5,6 Large effects of an a-axis magnetic field on the dielectric constant 7 and the FE polarization 6 have been reported. Upon decreasing temperature T the sequence of phase transitions is similar for most RMn 2 O 5 . AFM order develops at T N1 = 43 K with an incommensurate ͑IC͒ magnetic modulation described by q ជ = ͑0.5+ ␤ , 0 , 0.25+ ␦͒ ͑where ␤ , ␦ Ͻ 0 indicate the deviations from c...

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Magnetoelastic effects and the magnetic phase diagram of multiferroicDyMn2O5

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“…Since in bulk materials including Bi 6 Fe 2 Ti 3 O 18 , so far no observation of MD effect under ultra-low magnetic field with the magnitude of 10 Oe has been reported, therefore, the results presented in this letter strongly suggest the uniqueness of thin films can be regarded as reasons for ultra-low-field magnetodielectric behaviors, as well as high sensitivity of magnetodielectric from compositions and structures [24]. Thin film can be considered as a quasi-two-dimension system and the quantum interference becomes important, where the spin-orbit interaction has only the z-component and magnetic scattering could set in dominantly under very low magnetic fields [25].…”

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Magnetodielectric effect of Bi₆Fe₂Ti₃O₁₈film under an ultra-low magnetic field

et al. 2006

J. Phys.: Condens. Matter

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Good quality and fine grain Bi 6 Fe 2 Ti 3 O 18 magnetic ferroelectric films with single-phase layered perovskite structure have been successfully prepared via metal organic decomposition (MOD) method. Results of low-temperature magnetocapacitance measurements reveal that an ultra-low magnetic field of 10 Oe can produce a nontrivial magnetodielectric (MD) response in zero-field-cooling condition, and the relative variation of dielectric constants in magnetic field is positive, i.e., [ε r (H)-ε r (0)]/ε r (0)=0.05, when T<55K, but negative with a maximum of [ε r (H)-ε r (0)]/ε r (0)=-0.14 when 55K

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Crystal Growth of Magnetic Materials

Behr

Löser

2007

Handbook of Magnetism and Advanced Magnetic Materials

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In this chapter, the various methods for crystal growth of magnetic materials are summarized and principles of choosing the appropriate growth method, which depends on phase diagram features of the alloy system, the required size, physical, and chemical perfection of single crystalline samples, are briefly discussed. The crystal growth of the following classes of materials is considered: soft magnetic pure metals and alloys, highly anisotropic compounds for high‐density magnetic recording media, rare earth–transition metal compounds for high‐performance permanent magnets, high‐magnetostrictive intermetallic compounds and ferromagnetic shape memory alloys for magnetomechanical applications, magnetocaloric materials, selected intermetallic compounds for spintronics, multiferroic materials, and some other less‐common magnetic compounds.

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Colossal Magnetodielectric Effects inDyMn2O5

Cited by 364 publications

References 26 publications

Magnetoelastic effects and the magnetic phase diagram of multiferroicDyMn2O5

Magnetoelastic effects and the magnetic phase diagram of multiferroicDyMn2O5

Magnetodielectric effect of Bi₆Fe₂Ti₃O₁₈film under an ultra-low magnetic field

Crystal Growth of Magnetic Materials

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Colossal Magnetodielectric Effects inDyMn2O5

Cited by 364 publications

References 26 publications

Magnetoelastic effects and the magnetic phase diagram of multiferroicDyMn2O5

Magnetoelastic effects and the magnetic phase diagram of multiferroicDyMn2O5

Magnetodielectric effect of Bi6Fe2Ti3O18film under an ultra-low magnetic field

Crystal Growth of Magnetic Materials

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Magnetodielectric effect of Bi₆Fe₂Ti₃O₁₈film under an ultra-low magnetic field