Exchange Bias Phenomena in Magnetic Heterostructures
Summary
The exchange bias effect manifests as a unidirectional shift of the magnetic hysteresis loop in systems comprising a ferromagnet coupled to an antiferromagnet or spin-disordered phase. Originally observed in core–shell nanoparticles and thin‐film bilayers, this interfacial phenomenon has become central to spintronic devices, magnetic sensors and non‐volatile memory. At its heart lies the exchange coupling across a chemically or structurally defined interface, which pins the ferromagnetic layer and alters coercivity, loop symmetry and thermal stability. Recent advances have elucidated the role of interfacial roughness, spin frustration and domain‐state evolution, enabling engineered heterostructures that operate at elevated temperatures and with tailored bias fields. Progress in crystal growth and lithographic patterning has extended exchange bias from simple bilayers to complex multilayer stacks, nanowire arrays and two‐dimensional intercalated compounds, opening routes to energy‐efficient magnetic switching and directional spin transport.
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Exchange Bias Phenomena in Magnetic Heterostructures publication trend
The graph below shows the total number of articles in exchange bias phenomena in magnetic heterostructures across all publications each year (not limited to Nature Index journals).
Technical terms
Exchange bias: A unidirectional anisotropy causing a horizontal shift of the magnetic hysteresis loop due to interfacial coupling between magnetic phases.
Ferromagnet: A material in which atomic magnetic moments align parallel, producing a net magnetisation.
Antiferromagnet: A material with ordered, antiparallel magnetic moments that cancel overall magnetisation.
Spin glass: A disordered magnetic state characterised by frustrated, randomly frozen spins and slow relaxation dynamics.
Coercivity: The magnitude of the applied field required to reduce the magnetisation of a ferromagnet to zero.
Hysteresis loop: The plot of magnetisation versus applied magnetic field, illustrating memory and energy‐dissipation behaviour.
Unidirectional anisotropy: Directional magnetic preferential axis induced by exchange interactions at an interface.
References
- Near Room-Temperature Intrinsic Exchange Bias in an Fe Intercalated ZrSe2 Spin Glass. Journal of the American Chemical Society (2023).
- Exchange Bias in La0.67Sr0.33MnO3/YFeO3 Ferromagnet/Antiferromagnet Multilayer Heterostructures. Small (2025).
- Exchange Bias in Nanostructures: An Update. Nanomaterials (2023).
- Exchange bias and two steps magnetization reversal in porous Co/CoO layer. Materials & Design (2019).
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