Control of magnetization-reversal processes via uniaxial anisotropy strength in La0.67Sr0.33MnO3 electrodes for spintronic devices
Physical Review Applied
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Phillips, L., Yan, W., Moya Raposo, X., Ghidini, M., Maccherozzi, F., Dhesi, S., & Mathur, N. (2015). Control of magnetization-reversal processes via uniaxial anisotropy strength in La0.67Sr0.33MnO3 electrodes for spintronic devices. Physical Review Applied, 4 (064004)https://www.repository.cam.ac.uk/handle/1810/251279
Spintronic device performance depends critically on magnetization-reversal processes, but these are rarely imaged in order to verify correct operation. Here we use magnetometry and magnetic imaging to study thin films and patterned elements of highly spin-polarized La0.67Sr0.33MnO3, grown epitaxially on NdGaO3 substrates whose crystallographic orientation determines magnetic anisotropy strength. Small anisotropy yields gradual magnetization reversal via nucleation and propagation of small needle domains, whereas large anisotropy yields a single nucleation event resulting in sharp and complete magnetization reversal. These observed differences are explained using micromagnetic simulations, and exploited in order to quantify the effect of La0.67Sr0.33MnO3 electrode behaviour on spin signals from hypothetical devices. Our work therefore highlights the dramatic discrepancies that can arise between the design and performance of spintronic devices.
This work was funded by grant F/09 154/E from The Leverhulme Trust and a UK EPSRC DTA award (L. C. P.), Isaac Newton Trust grant 10.26(u) and UK EPSRC grant EP/E0026206 (M. G.), and Herchel Smith and Spanish MEC Ramón y Cajal Fellowships (X. M.).
Royal Society (uf120210)
This record's URL: https://www.repository.cam.ac.uk/handle/1810/251279
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Licence URL: http://creativecommons.org/licenses/by-nc/2.0/uk/
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