Effect of phase transformation on the converse magnetoelectric properties of a heterostructure of Ni49.2Mn29.6Ga21.2 and 0.7PbMg1/3Nb2/3O3-0.3PbTiO3 crystals

Zeng, M.; Or, Siu Wing; Chan, Helen Lai Wa

doi:doi:10.1063/1.3427388

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Microstructure and ferromagnetic property in CaRuO₃ thin films with pseudoheterostructure

CaRuO3 thin films were synthesized on SrTiO3 substrates by pulsed laser deposition. Detailed microstructure analysis by transmission electron microscopy revealed the pseudoheterostructure in CaRuO3 films. It consists of a coherently strained cubic CaRuO3 layer contacted with substrate, as well as a strained orthorhombic CaRuO3 layer. The orthorhombic CaRuO3 layer is composed of two types of domains. The ferromagnetic property of the pseudoheterostructure CaRuO3 was revealed by superconducting q...

1550 nm band optical input module with superconducting single-flux-quantum circuit

We developed an optical input module with a superconducting single-flux-quantum (SFQ) circuit for application of ultrafast photonic networks in the near future. The optical input module, consisting of a built-in photodiode (PD) with a coplanar waveguide transmission line, was fabricated on an InP substrate and flip-chip bonded with the SFQ circuit on a Si substrate. The fabricated PD showed photosensitivities of more than 0.2 A/W for the wavelength range 1480 to 1530 nm at 4.2 K. SFQ pulses wer...

We report experimentally and theoretically the effect of phase transformation on the converse magnetoelectric (CME) properties of a heterostructure formed by one layer of piezoelectric 0.7PbMg_1/3Nb_2/3O₃-0.3PbTiO₃ (PMN-PT) crystal sandwiched between two layers of ferromagnetic shape memory Ni_49.2Mn_29.6Ga_21.2 (Ni–Mn–Ga) crystal. The CME coefficient (α_B) of the heterostructure remains minimally and relatively constant in the martensitic phase (<28 °C), attains its maximum value in the martensitic-austenitic phase transformation (28–39 °C), and decreases gradually with increasing temperature in the austenitic phase (>39 °C). Giant resonance α_B of 18.6 G/V is found at 32 °C under a very low bias magnetic field of 150 Oe.

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KEYWORDS and PACS

Keywords

ferromagnetic materials, gallium alloys, interface magnetism, lead compounds, magnetoelectric effects, manganese alloys, nickel alloys, piezoelectric materials, shape memory effects, solid-state phase transformations

PACS

75.70.Cn

Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Cc

Other ferromagnetic metals and alloys
64.70.K-

Solid-solid transitions
75.85.+t

Magnetoelectric effects, multiferroics
77.84.Cg

PZT ceramics and other titanates
77.65.-j

Piezoelectricity and electromechanical effects

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http://dx.doi.org/10.1063/1.3427388

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0003-6951 (print)

1077-3118 (online)

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American Institute of Physics

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