Modulation of spin‐transport and spin‐minibands in a magnetic superlattice

Kim, Jin-Woo; Kim, Heesang; Kim, Nammee

doi:10.1002/pssb.201147273

Cited by 2 publications

(5 citation statements)

References 33 publications

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“…For a spin device application of a MSL, it is important to have sizable conductance for spin-polarized electric currents. In this work, by analyzing the energy miniband dispersion and the spin-dependent transmission probability of the quasi-onedimensional MSL, we note that the transmission probability profile for each channel is strongly related to the width of the wire, which was not a concern in the previous work [13]. In general, due to the carrier confinement effect, a thinner wire is expected to be more efficient than a thicker one in producing a spin-polarized current, independent of the ratio among the size parameters of MSL.…”

Section: Introductionmentioning

confidence: 89%

“…The following calculation shows the analytical derivation of conditions to synchronize the spin directions between channels. The notations as well as the calculations here follow closely those in [13]. The transmission matrix T σ n , depending on spins (σ = σ z ), for a single-cell of the MSL with a unit interval a at the channel n can be obtained as [13] T…”

Section: Formalismmentioning

confidence: 99%

“…The notations as well as the calculations here follow closely those in [13]. The transmission matrix T σ n , depending on spins (σ = σ z ), for a single-cell of the MSL with a unit interval a at the channel n can be obtained as [13] T…”

Section: Formalismmentioning

confidence: 99%

“…The low spin-polarization rate of the 2DEG with various magnetic barriers improved by reducing the dimension of the electron gas system and by increasing the number of magnetic barriers [12]. In our previous work [13], we showed that a fully spin-polarized current could be realized through a quasi-onedimensional magnetic superlattice (MSL). Periodic magnetic barriers in MSL are produced by an arrangement of a gridded superconducting mask under the semiconductor nanowire, which can be formed by a split gate technique on a 2DEG as shown in figure 1.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of the spin conductance of a spin filter

Kim¹,

Kim²,

Kim³

2013

Semicond. Sci. Technol.

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For a spin device application of a magnetic superlattice, we investigate the optimal condition to obtain a fully spin-polarized current with sizable ballistic conductance. We consider a quasi-one-dimensional magnetic superlattice, formed by a periodic magnetic field and a split gate technique on a two-dimensional electron gas system. We obtain such a condition by analyzing an energy miniband dispersion and a spin-dependent transmission probability for each channel. The transfer matrix theory and Bloch's theorem are used in the detailed calculation. From the results, we propose an optimized aspect ratio of size parameters of a quasi-one-dimensional magnetic superlattice as a spin filter to generate currents having simultaneous full spin polarization and sizable ballistic conductance.

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Section: Introductionmentioning

confidence: 89%

Section: Formalismmentioning

confidence: 99%

Section: Formalismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhancement of the spin conductance of a spin filter

Kim¹,

Kim²,

Kim³

2013

Semicond. Sci. Technol.

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“…This alternate model states that there is a difference in regression weights across the different group time periods. R code developed by Kim (2012) was utilized in this power analysis. In this case, after running the multiple simulations using the model, the number of simulations that resulted in a significant chi-square (difference) between the population or null model and the alternate model determined the power.…”

Section: Power Analysismentioning

confidence: 99%

Temporal Associations between Prenatal Psychosocial Context and Birth Outcomes

Schminkey¹

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Background: In the United States approximately one in eight babies is born preterm (before 37 completed weeks gestation), and one in twelve infants are born low birthweight (<2500 grams). These poor birth outcomes lead to neonatal morbidity and mortality as well as lifelong developmental and health issues that affect both the quality of life for families and convey a costly economic burden to these families and the public. Psychoneuroimmune interactions in response to stressful events or conditions alter cell signaling throughout the body During pregnancy, the maturing placenta is an active endocrine and immune organ; however, its' contributions to stress processing evolve as the pregnancy progresses. Approximately thirty percent of preterm births are attributable to endocrine immune changes that are related to stress processing. Purpose: To evaluate the evolutionary framework of Adaptive Reproduction a theoretical basis for understanding how environmental stressors and psychoneurological states impact birth outcomes. Two hypotheses were tested: 1) does the impact of stress, depression, tobacco use and social support on adverse birth outcomes vary across the gestation? And 2) does the experience of perinatal intimate partner violence (IPV) affect the timing of the impact of stress, depression, tobacco use and social support on birth outcomes? Sample and Setting: The sample included women involved in the BabyBEEP study (R01 NR05313) that evaluated the efficacy of a smoking cessation intervention for lowincome pregnant women (N=695). Data was collected between 2002 and 2006 in 21 counties in rural Missouri. Thirty-four percent of the sample experienced perinatal intimate partner violence. Methods: Data was restructured for secondary analysis using a multilevel structural equation model. Findings: Both hypotheses were supported by the analysis. When controlling for the other variables, stress and social support have paradoxical effects at different stages of pregnancy. In women experiencing perinatal IPV, depression, particularly prior to 24 weeks, is associated with both low birthweight and preterm birth. Conclusion: Adaptive reproduction provides a plausible explanation for why psychoneuroimmune alterations sometimes lead to preterm birth and low birthweight. This provides a theoretical basis for how community and individual level preconceptional and prenatal interventions aimed at enhancing functional social support and stress resilience improve outcomes. iii Acknowledgments  Foremost, I would like to thank my mentor, advisor and committee chair, Dr. Linda Bullock, for investing much time and effort into my success in this doctoral program. Dr. Bullock is an exemplary nurse scientist; I admire the discernment, diplomacy, tenacity, and caring spirit she uses to tackle sensitive, difficult issues.  I offer my sincere thanks to my committee members. I give special thanks to Dr. Timo Von Oertzen for agreeing to undertake this project as primary technical consultant. Dr. Von Oertzen contributed many hours to problem...

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Modulation of spin‐transport and spin‐minibands in a magnetic superlattice

Cited by 2 publications

References 33 publications

Enhancement of the spin conductance of a spin filter

Enhancement of the spin conductance of a spin filter

Temporal Associations between Prenatal Psychosocial Context and Birth Outcomes

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