Spintronic Memory Technologies and Radiation Effects

Spintronic memory harnesses the intrinsic spin of electrons and the associated magnetic moment to store information in non-volatile devices. Key architectures include spin-transfer torque magnetic random-access memory (STT-MRAM), which employs spin-polarised currents to toggle magnetic tunnel junctions (MTJs), and spin-orbit torque variants that use orthogonal spin currents for rapid switching. These technologies offer high endurance, low power consumption and fast access times, making them attractive for mainstream computing, embedded systems and emerging in-memory computing paradigms. In parallel, radiation hardness has emerged as a critical requirement for applications in space, high-altitude platforms and nuclear instrumentation. Ionising radiation and high-energy particles can induce single-event upsets (SEUs), alter magnetic anisotropy, generate displacement damage and degrade tunnelling barriers, potentially compromising device reliability. Recent advances have elucidated the mechanisms by which cumulative total ionising dose (TID) and individual particle strikes affect MTJ performance, from gradual shifts in switching currents to catastrophic barrier breakdown. Strategies to mitigate these effects include materials optimisation, interface engineering, redundancy schemes and novel architectures based on domain-wall or skyrmion conduits. The interdependence of materials science, device physics and circuit-level design underpins progress towards robust, radiation-resilient spintronic memories, with implications for global telecommunications, satellite systems and safety-critical controls.

Research from Nature Portfolio

Recent studies have demonstrated that nanoscale MTJs with perpendicular magnetic anisotropy maintain core performance metrics after exposure to high total ionising doses of gamma and neutron radiation. Measurements of tunnelling magnetoresistance, magnetic-field-driven switching and current-induced magnetisation reversal showed negligible degradation up to extreme doses, confirming inherent radiation resilience of perpendicular MTJs for next-generation memory and non-von Neumann computing. In complementary work, investigations of MTJs subjected to high-dose X-ray irradiation up to 10 Mrad(Si) revealed that junction resistance and switching properties remain stable up to 8 Mrad, but that oxygen vacancy formation in the MgO barrier leads to rapid breakdown at higher doses. Structural analysis of the CoFeB/MgO interface highlighted radiation-induced barrier degradation, providing a clear threshold for reliable operation in space environments.

Research from all publishers

Experimental evaluation of emerging non-volatile memories under proton, neutron and thermal radiation has shown that ferroelectric, resistive and magnetic technologies exhibit robust static immunity but can suffer dynamic SEUs when operating at high frequencies. MRAM devices in particular displayed strong resistance to bit flips in static mode, while bit-cell susceptibility increased during write operations under neutron bombardment. In material-level studies, argon ion irradiation was employed to tune perpendicular magnetic anisotropy in a Heusler alloy thin film, revealing that interface intermixing reduces anisotropy energy and can be harnessed to optimise switching thresholds for sensor and memory applications. Meanwhile, a novel circuit-level approach introduced a triple-modular-redundancy design based on STT-MTJ devices, using parallel voting schemes to mask SEUs and enhance error tolerance. Simulations confirmed significant improvements in radiation-hardened performance, illustrating a pathway for system-level hardening of spintronic memories.

Spintronic Memory Technologies and Radiation Effects publication trend

The graph below shows the total number of articles in spintronic memory technologies and radiation effects across all publications each year (not limited to Nature Index journals).

Technical terms

Spintronic memory: Non-volatile memory that encodes data through electron spin states rather than electric charge.

Magnetic tunnel junction (MTJ): Device composed of two ferromagnetic layers separated by a thin insulating barrier, whose resistance depends on relative magnetisation orientation.

Spin-transfer torque (STT): Phenomenon by which a spin-polarised current exerts torque on a magnetic layer, enabling magnetisation switching.

Perpendicular magnetic anisotropy (PMA): Preferential alignment of magnetic moments perpendicular to the film plane, improving thermal stability and scaling.

Tunnelling magnetoresistance (TMR): Change in electrical resistance of an MTJ resulting from parallel or antiparallel alignment of electrode magnetisations.

Single-event upset (SEU): Bit error caused by the passage of a single ionising particle through a device, altering a stored state.

Total ionising dose (TID): Cumulative energy deposited by ionising radiation that can induce threshold shifts and barrier degradation over time.

References

1. Immunity of nanoscale magnetic tunnel junctions with perpendicular magnetic anisotropy to ionizing radiation. Scientific Reports (2020).
2. High-dose X-ray radiation induced MgO degradation and breakdown in spin transfer torque magnetic tunnel junctions. Scientific Reports (2022).
3. Single Event Upsets Under Proton, Thermal, and Fast Neutron Irradiation in Emerging Nonvolatile Memories. IEEE Access (2022).
4. Shaping Perpendicular Magnetic Anisotropy of Co2MnGa Heusler Alloy Using Ion Irradiation for Magnetic Sensor Applications. Sensors (2023).
5. A Radiation-Hardened Triple Modular Redundancy Design Based on Spin-Transfer Torque Magnetic Tunnel Junction Devices. Applied Sciences (2024).