Collins Ashu Akosa

PhD Student

Research Interests

​Temperature effects on spin transport and spin torque; spin transport in ferromagnetic and antiferromagnetic textures

Selected Publications

​Intrinsic non-adiabatic topological torque in magnetic skyrmions and vortices
C.A. Akosa, P.B. Ndiaye, and A. Manchon
Phys. Rev. B 95, 054434 (2017)​
Topological Hall and spin Hall effects in disordered skyrmionic textures
P.B. Ndiaye, C.A. Akosa, and A. Manchon
Phys. Rev. B 95, 064426 (2017)​

Dirac Spin-Orbit Torques and Charge Pumping at the Surface of Topological Insulators
P.B. Ndiaye, C.A. Akosa, M.H. Fischer, A. Vaezi, E.-A. Kim, and A. Manchon
Phys. Rev. B 96, 014408 (2017)​​

Phenomenology of chiral damping in noncentrosymmetric magnets
C.A. Akosa, I.M. Miron, G. Gaudin, A. Manchon
Phys. Rev. B 93, 214429 (2016)​

Enhanced non-adiabaticity in vortex cores due to the emergent Hall effect
A. Bisig, C. A. Akosa, J.-H. Moon, J. Rhensius, C. Moutafis, A. von Bieren, J. Heidler, G. Kiliani, M. Kammerer, M. Curcic, M. Weigand, T. Tyliszczak, B. Van Waeyenberge, H. Stoll, G. Schutz, K.-J. Lee, A. Manchon, and M. Klaui
Phys. Rev. Lett. 117, 277203 (2016)​​​

Role of spin diffusion in current-induced domain wall motion for disordered ferromagnets
C.A. Akosa, W.-S. Kim, A. Bisig, M. Klaui, K.-J. Lee, A. Manchon
Phys. Rev. B 91, 094411 (2015)​​​

Theory of Topological Spin Hall Effect in Antiferromagnetic Skyrmion: Impact on Current-induced Motion
C.A. Akosa, O.A. Tretiakov, G. Tatara, A. Manchon
arXiv preprint arXiv:1709.02931​​​


2016 - 2011 PhD in Material Science and Engineering
King Abdullah University of Science and Technology, Thuwal, Saudi Arabia

2010 – 2009 MSc in Physics Joint program 
Perimeter Institute for Theoretical Physics & University of Waterloo, ON, Canada

2009 - 2008 MSc in Theoretical Physics
African University of Science and Technology Abuja, Nigeria

2006 - 2003 BSc in Mathematics and Computer Science
University of Buea, Cameroon​

Professional Profile

​2011-2010 Graduate Teaching Assistance (Tutor) 
University of Waterloo

2008-2007​ Database and Linux System administrator in a project of Computerizing Driving Licenses
the Ministry of Transport, Cameroon​

2007-2006 Teaching - Mathematics, Physics and Computer Science
Government Technical School Limbe