Fig. 4

Comparison of Heusler compound to Co-Fe-B MTJs. a The TMS ratios (determined at 150 mW laser power) of Co₂FeAl is twice as high compared to Co₂₆Fe₅₄B₂₀ and possesses an inversed sign. b For the TMR ratios (at 10 mV bias voltage) of the same MTJs the opposite is found. c TMS ratios for various Co₂FeAl and Co₂FeSi based MTJs in comparison to MTJs with two different Co-Fe-B compositions. d Corresponding Seebeck-voltages −SΔT at a laser power of 150 mW in the P and AP configuration of the MTJs. e TMR ratio of the MTJs at 10 mV bias. Only the Heusler based MTJs simultaneously exhibit a large Seebeck voltage and high TMS ratio