Magnetic reversal in Mn5Ge3 thin films: an extensive study
L-A Michez1, A Spiesser, M Petit
1Aix Marseille Université, CNRS, CINaM-UMR 7325, 13288, Marseille, France.
Summary
Magnetization reversal in Mn5Ge3 thin films shows a transition from in-plane to out-of-plane easy axis magnetization with increasing thickness. This study reveals stripe magnetic structures crucial for spintronic applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Understanding magnetization reversal is key for developing advanced magnetic materials.
- Thin films of manganese germanide (Mn5Ge3) are promising for spintronic applications.
- Controlling magnetic anisotropy in thin films is essential for device performance.
Purpose of the Study:
- To comprehensively study the magnetization reversal process in Mn5Ge3 thin films.
- To investigate the influence of film thickness on the magnetic anisotropy of Mn5Ge3.
- To determine key magnetic parameters for potential spintronic device applications.
Main Methods:
- Thin films of Mn5Ge3 were grown using molecular beam epitaxy.
- Magnetic anisotropy was studied as a function of film thickness using Vibrating Sample Magnetometry (VSM) and Superconducting Quantum Interference Device (SQUID) magnetometers.
- Phenomenological models were employed to analyze experimental results.
Main Results:
- A reorientational transition of the easy axis of magnetization from in-plane to out-of-plane was observed with increasing film thickness.
- Above a critical thickness of approximately 20 nm, stripe magnetic structures with alternating out-of-plane magnetization were evidenced.
- Magnetocrystalline anisotropy constant and saturation magnetization values were found to be in excellent agreement with bulk Mn5Ge3.
- The exchange constant, domain wall surface energy, and width were estimated for the first time in Mn5Ge3.
Conclusions:
- Mn5Ge3 thin films exhibit thickness-dependent magnetic anisotropy, transitioning to out-of-plane orientation above 20 nm.
- The observed stripe magnetic structure is significant for understanding magnetization reversal mechanisms.
- The determined magnetic parameters are vital for assessing Mn5Ge3's suitability for next-generation spintronic devices.
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