MRAM

MRAM
Name	MRAM
Type	Non-volatile memory
Inventor	IBM, Everspin Technologies
Introduced	2000s
Capacity	various
Access time	ns range
Power	low standby

MRAM MRAM is a class of non-volatile memory that stores data using magnetic states rather than electric charge. It combines features associated with Intel-class volatile random-access memory and persistent storage used by Seagate Technology and Western Digital, aiming to replace or complement technologies such as DRAM, SRAM, and NAND flash. MRAM's development involves a broad ecosystem including semiconductor foundries like TSMC and research institutions such as IMEC and Hitachi.

Introduction

MRAM was pursued by research teams at IBM, Toshiba, Samsung Electronics, and Micron Technology to leverage magnetic tunnel junctions pioneered with contributions from NVE Corporation and Crocus Technology. Device concepts intersect with work at universities including Stanford University, Massachusetts Institute of Technology, and University of Cambridge. Industry consortia and standards bodies like JEDEC and corporate alliances involving Intel and GlobalFoundries have shaped commercialization pathways.

Technology and Physical Principles

MRAM devices rely on spin-dependent transport across a thin insulating barrier in a magnetic tunnel junction, a principle explored by researchers at IBM Research and Hitachi Global Storage Technologies. Key physical effects include spin-transfer torque investigated at Cornell University and spin-orbit torque studied at University of California, Berkeley. The magnetic anisotropy and exchange bias engineering draw on foundational physics from investigators associated with Nobel Prize in Physics-related work and laboratories such as Los Alamos National Laboratory and Sandia National Laboratories. Control of magnetization uses write currents, magnetic fields, or spin currents, concepts developed alongside advances in CERN-scale magnetics and spintronics research at AIST.

Types of MRAM

Several MRAM variants emerged, including toggle MRAM developed by Everspin Technologies and spin-transfer torque MRAM driven by teams at Toshiba and Samsung; perpendicular magnetic anisotropy MRAM was advanced by SK Hynix. Additional approaches such as spin–orbit torque MRAM have been explored at University of Tokyo and Korea Advanced Institute of Science and Technology. Research into voltage-controlled MRAM has links to groups at University of California, Los Angeles and Harvard University, while hybrid memory concepts involve collaborations with companies like ARM Holdings and NVIDIA.

Fabrication and Materials

Fabrication methods use thin-film deposition techniques honed at Applied Materials and Lam Research fabs, with patterning by photolithography and etching processes used at facilities like TSMC and GlobalFoundries. Critical materials include ferromagnetic layers containing Cobalt and Iron alloys, magnesium oxide barriers developed through work at Imec and Purdue University, and heavy metals such as Tantalum and Platinum for spin–orbit torque stacks. Integration into CMOS flows occurred in pilot lines at Intel and pilot fabs of Samsung Electronics and involved metrology from KLA Corporation and packaging from Amkor Technology.

Performance and Characteristics

MRAM offers read/write speeds competitive with products from Micron Technology and latency targets similar to SK Hynix DRAM parts, with endurance metrics surpassing NAND flash as reported by Everspin Technologies. Energy consumption profiles have been benchmarked in collaborations involving ARM Holdings and Qualcomm, showing low standby power attractive to mobile platforms marketed by Apple Inc. and Samsung Electronics. Reliability testing protocols reflect standards from JEDEC and industrial test houses like UL and SGS.

Applications and Commercial Use

MRAM has been deployed in aerospace and defense projects coordinated with Northrop Grumman and Lockheed Martin, industrial automation systems from Siemens, and enterprise storage controllers supplied by Dell Technologies and Hewlett Packard Enterprise. Consumer electronics initiatives involve integration into smartphones by Sony-led consortia and IoT devices from Bosch and Texas Instruments. MRAM is used in automotive systems meeting requirements set by Bosch and Continental AG, and in embedded systems developed by STMicroelectronics and NXP Semiconductors.

History and Development

Early MRAM prototypes were demonstrated by IBM and Toshiba teams in the 1990s and 2000s, with commercial product introductions by Everspin Technologies in the 2010s. Research milestones trace to spintronics discoveries at University of California, San Diego and Tohoku University, and to Nobel-recognized advances connected with researchers affiliated with Max Planck Society and Bell Labs. Funding and technology transfer involved agencies and programs such as DARPA and national research councils in Japan and South Korea.

Challenges and Future Directions

Scaling MRAM to competitive densities faces lithography and materials challenges addressed at ASML-equipped fabs used by TSMC and Samsung Electronics. Thermal stability, write energy reduction, and integration with advanced nodes remain focal points for projects at IMEC, CEA-Leti, and university consortia including ETH Zurich. Emerging research at Delft University of Technology and University of Oxford explores combining MRAM with neuromorphic accelerators marketed by firms like Intel and Xilinx (now part of AMD). Standardization and ecosystem coordination continue through JEDEC and industry partnerships involving Micron Technology and SK Hynix.

Category:Non-volatile memory