Journal
APPLIED PHYSICS LETTERS
Volume 118, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/5.0037972
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Funding
- ImPACT Program of the Council for Science, Technology and innovation (Cabinet Office, Government of Japan)
- JSPS KAKENHI [16H06332]
- TIA collaborative research program Kakehashi Grant [TK20-019]
- New Energy and Industrial Technology Development Organization (NEDO) [JPNP16007]
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Giant tunnel magnetoresistance (TMR) ratios were achieved in epitaxial Fe/MgO/Fe(001) exchange-biased spin-valve magnetic tunnel junctions by tuning growth conditions for each layer and growing on a highly (001)-oriented Cr buffer layer. Specific features include symmetric differential conductance spectra and plateau-like deep local minima in dI/dV.
Giant tunnel magnetoresistance (TMR) ratios of 417% at room temperature (RT) and 914% at 3K were demonstrated in epitaxial Fe/MgO/Fe(001) exchange-biased spin-valve magnetic tunnel junctions (MTJs) by tuning growth conditions for each layer, combining sputter deposition for the Fe layers, electron-beam evaporation of the MgO barrier, and barrier interface tuning. Clear TMR oscillation as a function of the MgO thickness with a large peak-to-valley difference of similar to 80% was observed when the layers were grown on a highly (001)-oriented Cr buffer layer. Specific features of the observed MTJs are symmetric differential conductance (dI/dV) spectra for the bias polarity and plateau-like deep local minima in dI/dV (parallel configuration) at |V|=0.2-0.5 V. At 3K, fine structures with two dips emerge in the plateau-like dI/dV, reflecting highly coherent tunneling through the Fe/MgO/Fe. We also observed a 496% TMR ratio at RT by a 2.24nm-thick-CoFe insertion at the bottom-Fe/MgO interface.
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