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Magnetic chirality and electric polarization in multiferroic YMn$$_{2}$$O$$_{5}$$

脇本 秀一; 木村 宏之*; 福永 守*; 坂本 勇馬*; 野田 幸男*; 加倉井 和久

no journal, , 

There are two candidates of the origin of the magnetic-driven ferroelectricity in YMn$$_{2}$$O$$_{5}$$, one is the $$S$$$$times$$$$S$$ model and the other is the $$S$$$$cdot$$$$S$$ model. We have measured spin chirality and polarization of YMn$$^{4+}$$(Mn$$_{1-x}$$Ga$$_{x}$$)$$^{3+}$$O$$_{5}$$ where non-magnetic Ga ions dilute the $$S$$$$cdot$$$$S$$ contribution. We have succeeded to separate these two contributions, and found that the $$S$$$$times$$$$S$$ mechanism is dominant in the low-temperature phase while the $$S$$$$cdot$$$$S$$ mechanism is dominant in the intermediate temperature phase.

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Neutron scattering activities on multiferroic systems; Neutron diffraction experiments on hexaferrites

加倉井 和久; 脇本 秀一; 石渡 晋太郎*; 奥山 大輔*; 西 正和*; 徳永 祐介*; 有馬 孝尚*; 田口 康二郎*; 十倉 好紀*

no journal, , 

The discovery of magnetoelectric (ME) effects caused by a cycloidal spin order has initiated an intense research on new class of ME materials. Among them one interesting class of materials is the hexaferrites such as Y-type (A$$_{2}$$Me$$_{2}$$Fe$$_{12}$$O$$_{22}$$: Me=transition metal), M-type (AFe$$_{12}$$O$$_{19}$$: A=Pb, Ca, Sr, Ba, etc.), where types of elementary blocks and their stacking order are different. These materials show a variety of complex magnetic ordering. In this presentation recent neutron diffraction experiments on multiferroic hexaferrites performed at the JRR-3 Neutron Science Facility of Japan Atomic Energy Agency (JAEA) are reported.

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