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- Grigorev, Vladimir, et al.
(författare)
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Optically Triggered Néel Vector Manipulation of a Metallic Antiferromagnet Mn2Au under Strain
- 2022
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Ingår i: ACS Nano. - : American Chemical Society (ACS). - 1936-0851 .- 1936-086X. ; 16:12, s. 20589-20597
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Tidskriftsartikel (refereegranskat)abstract
- The absence of stray fields, their insensitivity to external magnetic fields, and ultrafast dynamics make antiferromagnets promising candidates for active elements in spintronic devices. Here, we demonstrate manipulation of the Néel vector in the metallic collinear antiferromagnet Mn2Au by combining strain and femtosecond laser excitation. Applying tensile strain along either of the two in-plane easy axes and locally exciting the sample by a train of femtosecond pulses, we align the Néel vector along the direction controlled by the applied strain. The dependence on the laser fluence and strain suggests the alignment is a result of optically triggered depinning of 90° domain walls and their motion in the direction of the free energy gradient, governed by the magneto-elastic coupling. The resulting, switchable state is stable at room temperature and insensitive to magnetic fields. Such an approach may provide ways to realize robust high-density memory device with switching time scales in the picosecond range.
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| 2. |
- KC, Ashish, 1982-, et al.
(författare)
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Scaling up quality improvement intervention for perinatal care in Nepal (NePeriQIP); study protocol of a cluster randomised trial
- 2017
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Ingår i: BMJ Global Health. - : BMJ. - 2059-7908. ; 2:3
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Tidskriftsartikel (refereegranskat)abstract
- INTRODUCTION: Nepal Perinatal Quality Improvement Project (NePeriQIP) intends to scale up a quality improvement (QI) intervention for perinatal care according to WHO/National guidelines in hospitals of Nepal using the existing health system structures. The intervention builds on previous research on the implementation of Helping Babies Breathe-quality improvement cycle in a tertiary healthcare setting in Nepal. The objective of this study is to evaluate the effect of this scaled-up intervention on perinatal health outcomes.METHODS/DESIGN: Cluster-randomised controlled trial using a stepped wedged design with 3 months delay between wedges will be conducted in 12 public hospitals with a total annual delivery rate of 60 000. Each wedge will consist of 3 hospitals. Impact will be evaluated on intrapartum-related mortality (primary outcome), overall neonatal mortality and morbidity and health worker's performance on neonatal care (secondary outcomes). A process evaluation and a cost-effectiveness analysis will be performed to understand the functionality of the intervention and to further guide health system investments will also be performed.DISCUSSION: In contexts where resources are limited, there is a need to find scalable and sustainable implementation strategies for improved care delivery. The proposed study will add to the scarce evidence base on how to scale up interventions within existing health systems. If successful, the NePeriQIP model can provide a replicable solution in similar settings where support and investment from the health system is poor, and national governments have made a global pledge to reduce perinatal mortality.TRIAL REGISTRATION NUMBER: ISRCTN30829654.
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