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Low-energy magnon e...
Low-energy magnon excitations and emerging anisotropic nature of short-range order in CrI3
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- Jonak, M. (author)
- Heidelberg Univ, Kirchhoff Inst Phys, INF 227, D-69120 Heidelberg, Germany.
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- Walendy, E. (author)
- Heidelberg Univ, Kirchhoff Inst Phys, INF 227, D-69120 Heidelberg, Germany.
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- Arneth, J. (author)
- Heidelberg Univ, Kirchhoff Inst Phys, INF 227, D-69120 Heidelberg, Germany.
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- Abdel-Hafiez, Mahmoud (author)
- Uppsala universitet,Energimaterialens fysik
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- Klingeler, R. (author)
- Heidelberg Univ, Kirchhoff Inst Phys, INF 227, D-69120 Heidelberg, Germany.
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Heidelberg Univ, Kirchhoff Inst Phys, INF 227, D-69120 Heidelberg, Germany Energimaterialens fysik (creator_code:org_t)
- American Physical Society, 2022
- 2022
- English.
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In: Physical Review B. - : American Physical Society. - 2469-9950 .- 2469-9969. ; 106:21
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- We report on the low-energy magnetic excitations and the evolution of local magnetic fields in CrI3 in a broad frequency regime of 30–330 GHz and in magnetic fields up to 15 T. Modeling the magnon branches by means of a domain-based ferromagnetic resonance model provides the microscopic parameters describing the magnetic excitations in the two-dimensional ferromagnet. Our data reveal the anisotropy gap of Δ=80 GHz at 2 K, which remarkably remains finite at TC and vanishes only above TΔ≃80 K, i.e., for T≳1.3TC. Concomitantly, anisotropic local magnetic fields are probed by a shift of the resonance lines in the same temperature regime. Well above TC, we detect short-range magnetic correlations up to 200 K. The observed changing nature of the short-range correlations at TΔ confirms the importance of spin-orbit coupling for the evolution of long-range ferromagnetism which develops from magnetically anisotropic short-range order. In addition, our analysis of the macroscopic magnetization enables to estimate the number of correlated spins well above TC as well as the in-plane magnetic correlation length ξab.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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