Spin Seebeck effect in $\epsilon$-Fe${}_2$O${}_3$ thin layer with high coercive field

Abstract

Spin Seebeck effect has been investigated in Pt/$\epsilon$-Fe${}_2$O${}_3$ bilayers. The $\epsilon$-Fe${}_2$O${}_3$ thin layer with $40-70$~nm thickness were deposited by a spin-coating method on Y:ZrO${}_2$(100) substrates. The prepared layers are highly oriented with the easy magnetic $a$-axis parallel to the film surface. The magnetic hysteresis loops measured at room temperature with magnetic field parallel to the layer exhibit coercive fields up to 11.6~kOe, which is so far the highest value measured for $\epsilon$-Fe${}_2$O${}_3$ thin layer samples. The shape of the spin Seebeck hysteresis loops is similar to the shape of magnetization for single phase layers with coercive field around 10~kOe. In some prepared layers a small amount of secondary soft ferrimagnetic phase is revealed by a constricted shape of magnetization loops, in contrast to spin Seebeck loops, where no constriction is observed. A difference in encountered in the case of layers with a small amount ($1-2$~volume\%) of secondary soft ferrimagnetic phase, which is revealed by a constricted shape of magnetization loops, in contrast to spin Seebeck loops, where no constriction is observed.

7 pages, 5 figures

References in corpus (3)

• Multiferroic Iron Oxide Thin Films at Room-Temperature
• Longitudinal spin Seebeck coefficient: heat flux vs. temperature difference method
• Spin Seebeck effect in Y-type hexagonal ferrite thin films

Cited by in corpus (3)

• Spin Seebeck Effect: Sensitive Probe for Elementary Excitation, Spin Correlation, Transport, Magnetic Order, and Domains in Solids
• Investigation of Room Temperature Ferroelectricity and Ferrimagnetism in Multiferroic AlxFe2-xO3 Epitaxial Thin Films
• Stabilization of $\epsilon$-Fe${}_2$O${}_3$ epitaxial layer on MgO(111)/GaN via an intermediate $\gamma$-Fe${}_2$O${}_3$-phase