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Ambipolar operation of hybrid SiC-carbon nanotube based thin film transistors for logic circuits applications Appl. Phys. Lett. 101, 043121 (2012) Ab-initio calculations for a realistic sensor: A study of CO sensors based on nitrogen-rich carbon nanotubes AIP Advances 2, 032115 (2012) Electrical properties of the graphitic carbon contacts on carbon nanotube field effect transistors Appl. Phys. Lett. 101, 033101 (2012) Carbon nanotube based ultra-low voltage integrated circuits: Scaling down to 0.4V Appl.

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The effect of annealing on the microstructure and magnetostriction of Tb 0.3 Dy 0.7 Fe y for 1.4 ≤ y ≤ 1.7 was investigated. As the y value decreased, the volume fraction of the eutectic phase increased and this phase leaked out from a sample during annealing above the eutectic temperature, which significantly changed the magnetostrictive properties. We compare the effects of leakage of the eutectic phase and annealing on the magnetostriction and discuss the reasons. 1 Introduction Since Tb-Dy-Fe alloy has a giant magnetostriction at room temperature and produces comparable strains at considerably lower magnetic fields, these outstanding properties have offered a great potential for a variety of transducer and actuator applications [1].It has been considered that heat treatment of Tb-Dy-Fe alloy above the eutectic temperature significantly improved the magnetostrictive properties, because it relieved or redistributed the residual stresses of the as-grown specimens by localized melting near the eutectic phase and thereby either reduced the pinning of the domain walls or enhanced the rotation of the domain moments [2]. Thus, heat treatment has been regarded as an important process for optimizing the magnetostrictive properties of Tb-Dy-Fe alloy.However, as the volume fraction of the eutectic phase (VOE) was increased up to 10%, this phase leaked out from the specimens during heat treatment and this behavior affected the magnetostrictive properties as much as stress relief did. Our previous work [3] showed that the magnetostriction increased with an increase of the y value in as-grown Tb 0.3 Dy 0.7 Fe y specimens; on the contrary, the increase rate of the magnetostriction decreased as the y value increased after heat treatment. This means that the effectiveness of heat treatment was improved as the volume fraction of the eutectic phase increased and this enhancement was merely estimated due to an increase in the volume fraction of R(Tb 0.3 Dy 0.7 )Fe 2 phase by leaking out of the eutectic liquid phase during annealing. But, it is not sufficient to explain this effect and further study is required. Therefore, we investigated the amount of leaked eutectic phase during annealing with different VOEs and discuss the relationship between this behavior and the magnetostriction. In addition, the effect of leakage of the eutectic phase was compared with the annealing effect on the magnetostrictive properties.