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Role of magnetic chirality in polarization flip upon a commensurate-incommensurate magnetic phase transition in YMn$$_{2}$$O$$_{5}$$

Wakimoto, Shuichi  ; Kimura, Hiroyuki*; Sakamoto, Yuma*; Fukunaga, Mamoru*; Noda, Yukio*; Takeda, Masayasu  ; Kakurai, Kazuhisa

We have performed simultaneous measurements of magnetic chirality by using polarized neutrons and electric polarization along the $$b$$-axis of single crystals of YMn$$^{4+}$$(Mn$$_{1-x}$$Ga$$_{x}$$)$$^{3+}$$O$$_{5}$$ with $$x=0.047$$ and $$0.12$$, in which nonmagnetic Ga-ions dilute Mn$$^{3+}$$ spins. Measurements conducted under zero field heating after various field-cooling conditions evidence that the magnetic chirality of Mn$$^{4+}$$ cycloidal spins plays a dominant role in the incommensurate magnetic (ICM) phase, whereas the magnetic exchange striction by the Mn$$^{4+}$$-Mn$$^{3+}$$ chain plays a dominant role in the commensurate magnetic (CM) phase. The polarization of YMn$$_{2}$$O$$_{5}$$ flips upon CM to ICM phase transition because the ferroelectricity driven by the magnetic chirality and the exchange striction provides opposite directions of polarization.



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Category:Materials Science, Multidisciplinary



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