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Heat diffusion in a magnetic tunnel junction (MTJ) having a ferromagnetic/antiferromagnetic free layer is investigated. The MTJ is heated by an electric current pulse of power P HP , flowing through the junction in current perpendicular to the plane (CPP) geometry, via Joule heat dissipation in the tunnel barrier. According to a proposed one-dimensional (1D) model of heat diffusion, when an electric voltage is applied to the MTJ, the free layer experiences a transient temperature regime, characterized by an exponential increase of its temperature T AF with a time constant τ TR , followed by a steady temperature regime characterized by T AF = T RT +α P HP , where T RT is the room temperature and α is a constant. Magnetic transport measurements of exchange bias H EX acting on the free layer allow the determination of α and τ TR . The experimental values of α and τ TR are in agreement with those calculated using the 1D model and an estimation of the MTJ thermodynamic parameters based on the Dulong–Petit and Widemann–Franz laws.
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Păpuşoi et al. (2008) studied this question.
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