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Clamping of ferroelectric and antiferromagnetic order parameters of YMnO3

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Eiichi Hanamura1,4, Katsumi Hagita2 and Yukito Tanabe3

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LETTER TO THE EDITOR

It was observed that a ferroelectric domain boundary (DB) is always accompanied by an antiferromagnetic DB in hexagonal YMnO3, by means of interference effects of the second-harmonic signal. The clamping of these two order parameters at the ferroelectric DB is shown theoretically to originate from Dzyaloshinski–Moriya interaction. This interaction favouring a right angle between the neighbouring spins is found to be operative within the DB and to reverse the direction of the spins across the ferroelectric DB.


PACS

75.50.Dd Nonmetallic ferromagnetic materials

75.60.Ch Domain walls and domain structure

75.25.+z Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)

75.50.Ee Antiferromagnetics

75.10.-b General theory and models of magnetic ordering

Subjects

Condensed matter: electrical, magnetic and optical

Dates

Issue 3 (29 January 2003)

Received 19 November 2002

Published 13 January 2003



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