Strain-driven non-collinear magnetic ordering in orthorhombic epitaxial YMnO3 thin films

Details Strain-driven non-collinear magnetic ordering in orthorhombic epitaxial YMnO3 thin films Strain-driven non-collinear magnetic ordering in orthorhombic epitaxial YMnO3 thin films

2010-10-20

arxiv.org/abs/1010.4118v2

J. Appl. Phys. 108, 123917 (2010)

Physics

Condensed Matter

Materials Science

Text + Figs Accepted in J. Appl. Phys

Scientific paper

We show that using epitaxial strain and chemical pressure in orthorhombic YMnO3 and Co-substituted (YMn0.95Co0.05O3) thin films, a ferromagnetic response can be gradually introduced and tuned. These results, together with the measured anisotropy of the magnetic response, indicate that the unexpected observation of ferromagnetism in orthorhombic o-RMnO3 (R= Y, Ho, Tb, etc) films originates from strain-driven breaking of the fully compensated magnetic ordering by pushing magnetic moments away from the antiferromagnetic [010] axis. We show that the resulting canting angle and the subsequent ferromagnetic response, gradually increase (up to ~ 1.2\degree) by compression of the unit cell. We will discuss the relevance of these findings, in connection to the magnetoelectric response of orthorhombic manganites.

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