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Updated: Oct 14, 2025

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
Published on: October 5, 2013
Strain driven phase transition and mechanism for Fe/Ir(111) films
Chen-Yuan Hsieh1, Pei-Cheng Jiang1,2, Wei-Hsiang Chen1
1Department of Physics, National Taiwan Normal University, Taipei, 116, Taiwan.
Ultrathin iron (Fe) layers on iridium (Ir) substrates exhibit strain accumulation, driving a phase transition from face-centered cubic (fcc) to body-centered cubic (bcc) Fe. This critical thickness phenomenon offers insights into heterogeneous interface materials.
Area of Science:
- Materials Science
- Surface Science
- Crystallography
Background:
- Heterogeneous interfaces are crucial for developing materials with novel properties.
- Controlling pseudomorphic growth and nanostructure evolution relies on understanding interfacial phenomena.
- Limited knowledge exists regarding strain accumulation in ultrathin Fe layers on fcc substrates.
Purpose of the Study:
- To investigate strain accumulation in ultrathin Fe layers deposited on fcc substrates.
- To demonstrate a strain-driven phase transition in Fe layers on Ir(111).
- To elucidate the mechanism behind strain accumulation and phase transformation at bcc/fcc interfaces.
Main Methods:
- Experimental deposition of ultrathin Fe layers on Ir(111).
- Calculation of strain energy density using bulk and shear moduli.
- Analysis of lattice parameters and interfacial strain.
Main Results:
- Observed strain accumulation at the Fe/Ir(111) interface.
- Demonstrated a phase transition from fcc-Fe to bcc-Fe driven by strain.
- Identified a critical thickness for this strain-driven phase transition.
- Proposed a distortion mechanism linking interfacial strain, surface energy, and critical thickness.
Conclusions:
- Strain accumulation at the bcc/fcc interface is a key factor in phase transitions.
- The proposed mechanism accurately predicts phase transitions based on interfacial energy and critical thickness.
- Findings provide fundamental understanding for designing materials with controlled interfacial properties.
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