2009
DOI: 10.1103/physrevb.80.041305
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Bias-controlled sensitivity of ferromagnet/semiconductor electrical spin detectors

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Cited by 56 publications
(60 citation statements)
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References 27 publications
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“…The amplitude of the signal ∆V 3T (B z = 0) decreases monotonically with temperature, a trend inconsistent with that of the spin diffusion length and lifetime, indicating that other factors, such as spin injection/detection efficiency, may be responsible. The detector efficiency, for example, has been shown to exhibit pronounced bias dependence at a fixed temperature 25 . The temperature dependence of the detection efficiency has not been addressed to date, and is beyond the scope of this paper.…”
mentioning
confidence: 99%
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“…The amplitude of the signal ∆V 3T (B z = 0) decreases monotonically with temperature, a trend inconsistent with that of the spin diffusion length and lifetime, indicating that other factors, such as spin injection/detection efficiency, may be responsible. The detector efficiency, for example, has been shown to exhibit pronounced bias dependence at a fixed temperature 25 . The temperature dependence of the detection efficiency has not been addressed to date, and is beyond the scope of this paper.…”
mentioning
confidence: 99%
“…However, at negative bias (injection), ∆V 3T (B z = 0) achieves a larger absolute magnitude indicating higher spin accumulation, but then saturates and slightly decreases. This is not fully understood at present, but may be because of either a bias dependence of the detector efficiency 25 or a spin bottleneck effect 27 -majority spin electrons flowing from the FM contact to the Si see a spin resistance generated by spin accumulation in the Si within a spin diffusion length of the contact interface, whereas unpolarized electrons flowing from the Si will not experience this effect. Note that a larger spin accumulation per unit current density is generated for injection than for extraction.…”
mentioning
confidence: 99%
“…Such a comparison is essentially needed in order to unambiguously establish a correlation between the 3T signal and the actual spin accumulation in the channel. What also has been overlooked in the recent discussion is the detection sensitivity of spin detecting contacts [18,19]. It was shown theoretically by Chantis and Smith [18] and observed experimentally by Crooker et al [19] that a current-biased spin detector has its sensitivity dramatically changed compared to a nonbiased case.…”
mentioning
confidence: 99%
“…2a). This may be attributed in part to the bias dependence of the detection efficiency 60 , or to less efficient spin filtering due to reduced spin polarization of the NiFe density of states above the Fermi level 61,62 , or to the decrease we observe in the spin lifetime at the higher biases considered in Fig. 5b.…”
Section: Resultsmentioning
confidence: 71%