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Enhanced skyrmion stability due to exchange frustration.

ABSTRACT: Skyrmions are localized, topologically non-trivial spin structures which have raised high hopes for future spintronic applications. A key issue is skyrmion stability with respect to annihilation into the ferromagnetic state. Energy barriers for this collapse have been calculated taking only nearest neighbor exchange interactions into account. Here, we demonstrate that exchange frustration can greatly enhance skyrmion stability. We focus on the prototypical film system Pd/Fe/Ir(111) and use an atomistic spin model parametrized from first-principles calculations. We show that energy barriers and critical fields of skyrmion collapse as well as skyrmion lifetimes are drastically enhanced due to frustrated exchange and that antiskyrmions are metastable. In contrast an effective nearest-neighbor exchange model can only account for equilibrium properties of skyrmions such as their magnetic field dependent profile or the zero temperature phase diagram. Our work shows that frustration of long range exchange interactions - a typical feature in itinerant electron magnets - is a route towards enhanced skyrmion stability even in systems with a ferromagnetic ground state.

SUBMITTER: von Malottki S

PROVIDER: S-EPMC5615047 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature

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Enhanced skyrmion stability due to exchange frustration.

von Malottki S S Dupé B B Bessarab P F PF Delin A A Heinze S S

Scientific reports 20170926 1

Skyrmions are localized, topologically non-trivial spin structures which have raised high hopes for future spintronic applications. A key issue is skyrmion stability with respect to annihilation into the ferromagnetic state. Energy barriers for this collapse have been calculated taking only nearest neighbor exchange interactions into account. Here, we demonstrate that exchange frustration can greatly enhance skyrmion stability. We focus on the prototypical film system Pd/Fe/Ir(111) and use an at ...[more]

PMID: 28951587

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Project description:Background: Studying abroad is one of the most exciting experiences for a college student who is running a student exchange program, as it creates opportunities to learn, work, solve problems, and ensure a secured life. However, Indonesians who are into student exchange programs face some difficulties in adjusting to their new environment. They experience awkwardness in the use of advanced equipment from technology and cultural aspects. This study investigates the experiences of two Indonesian students who participated for a semester at a Taiwanese university. It aims to explore the Indonesian student exchange program awardees' experiences by examining both the obstacles and benefits of attending the Taiwanese university. Methods: This study used qualitative data analysis. Data were collected through a semi-structured interview, informal participant observations, and a set of open and closed-ended questions. Two Indonesian undergraduate students who belonged to the same major, year, and university were recruited to act as ambassadors. Results: The two students reported facing some problems but felt more independent and became more adaptable. They met with new people and explored new places, and learned much in terms of teaching pedagogy and personal development from the 21 st-century classroom pedagogy, which was important for their future carrier in education. Aside from being able to feel the 21 st-century classroom environment, they were able to learn the host language and culture, which enriched their insights. Five main findings emerged: departure and journey, difficulties in settling in, inability to use technology facilities, meeting new people and exploring new places, and 21 st century classroom environment. Conclusions: Despite the challenges that are associated with being a student exchange awardee, there are vast opportunities for self-development and learning the ropes associated with teaching from the 21st-century classroom pedagogy.

Dataset Information

Enhanced skyrmion stability due to exchange frustration.

Publications

Enhanced skyrmion stability due to exchange frustration.

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