Abstract
This chapter reviews the requirements for the Heusler-alloy films to be used in spintronic devices. Four key requirements are identified to be large giant magnetoresistance (GMR), large tunnelling magnetoresistance (TMR), large spin-transfer torque and fast spin resonance. These requirements can be achieved by utilising the fundamental properties of the Heusler alloys, such as atomic substitution, generalised Slater-Pauling behaviour, crystalline ordering, half-metallicity, low damping constant, high Curie temperature, good lattice matching and large activation volume. To date the main obstacles for the Heusler-alloy films to be used in spintronic devices are their (i) high crystallisation temperature, (ii) interfacial atomic disordering and (iii) small activation volume. Here, we have investigated these properties for both epitaxial and polycrystalline films and have found a favourable crystallisation orientation to lower the ordering temperature by inducing a two-dimensional growth. We have demonstrated the effect of interfacial dusting to maintain the crystalline ordering from atomic diffusion by annealing. We have also established that the above requirements can be controlled by the competition between the structural and magnetic volume, the latter of which can be defined as activation volume. In all cases, the polycrystalline films have found to be advantageous over the epitaxial ones due to their strain-free growth with controlled grain size. We anticipate that the optimised polycrystalline films can be used in the next generation hard disk read heads and magnetic random access memory cells.
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Acknowledgments
The authors would like to thank Professor Kevin O’Grady for his support on the magnetic measurements and for fruitful discussion. We are also grateful for Professors Hiraku Endo and Tadachika Nakayama for their support on the film growth. This work was partially supported by EPSRC (EP/H026126/1 and EP/K03278X/1), Royal Society Research Grant and European Commission (NMP3-SL-2013-604398).
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Hirohata, A., Sagar, J., Fleet, L.R., Parkin, S.S.P. (2016). Heusler Alloy Films for Spintronic Devices. In: Felser, C., Hirohata, A. (eds) Heusler Alloys. Springer Series in Materials Science, vol 222. Springer, Cham. https://doi.org/10.1007/978-3-319-21449-8_9
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