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Kolodziej, Tomasz
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article
Magnetostriction of First and Second Order Magnetite Samples and its Relation to the Magnetic Easy Axis Switching
Abstract
<jats:p>Magnetic field (up to 8T) and temperature (10-300K) dependence of size of Zn doped magnetite samples Fe<jats:sub>3-x</jats:sub>Zn<jats:sub>x</jats:sub>O<jats:sub>4</jats:sub>(x=0.008, 0.022, i.e. falling within first and second order Verwey transition regime) were measured by the strain gauge method. Both samples experienced shrinking on cooling through the Verwey transition along monoclinic c axis, while the strong expansion was found for the 1<jats:sup>st</jats:sup>order sample in the a-b direction, unlike in the 2<jats:sup>nd</jats:sup>order sample. Magnetostriction of both samples is very small and limited to low fields only, concomitant with magnetization process. However, field application perpendicular to c axis and at T slightly below the Verwey transition temperature TV results in a large change of dimensions, coinciding with the axis switching process.</jats:p>