Magnetic Device Overview

Principles

Definition

Magnetic device is an academic concept and research area focusing on the design, characterization, and application of systems that leverage magnetic principles for specific functionalities. This field integrates knowledge from physics, materials science, and engineering to develop technologies critical for data storage, sensing, energy, and biomedical applications.

Ontological type

Core Principles

Materials and Structures

Application Domains

Key developments

Key Figures

Thin-Film and Bubble Engineering era

S. Foner [1], active in the Thin-Film and Bubble Engineering era (1958–1977), worked at institutions such as Massachusetts Institute of Technology [3] and University of Pennsylvania [4]. His key contribution was the versatile and sensitive vibrating-sample magnetometer [7], whose precision enabled reliable metrology of magnetic properties in thin films and bubble-domain systems, underpinning the era's quantitative models of pulse dynamics, geometry, and anisotropy. D. Speliotis [2] conducted research at University of Minnesota [5] and University of Minnesota System [6] during this era. His theoretical analyses—including A Theoretical Analysis of Saturation Magnetic Recording [8], Correlation between magnetic and recording properties in thin surfaces [9], and Theory and Experiment in Magnetic Recording [10]—laid a rigorous framework for understanding domain stability and thermomagnetic write-read behavior in thin-film devices.

Spin-Transfer Spintronics era

Daniel C. Ralph [1] is associated with Cornell University [3] and the University of Cambridge [4] during this era. His key contributions include co-authoring the 1999 paper Current-Induced Switching of Domains in Magnetic Multilayer Devices [7], which advanced the understanding of current-driven domain switching in multilayer devices and helped establish the relevance of spin-transfer torque concepts for nanoscale spintronics. J. A. Katine [2] is linked with Harvard University [5] and the University of California, Santa Barbara [6] in this era. He contributed to the 1999 paper Current-Induced Switching of Domains in Magnetic Multilayer Devices [7], providing experimental validation of current-induced switching and guiding device design and MRAM concepts within spin-transfer spintronics.

Voltage-Controlled Spin-Orbitronics era

Hideo Ohno [1] is a leading figure in voltage-controlled spin-orbitronics during this era, with affiliations at Indiana University School of Medicine [3] and the University of York [4]. His key contributions include the tunnel magnetoresistance of 604% at 300K by suppression of Ta diffusion in CoFeB/MgO/CoFeB pseudo-spin-valves annealed at high temperature [7], electric-field effects on thickness-dependent magnetic anisotropy of sputtered MgO/Co40Fe40B20/Ta structures [8], and electric field-induced magnetization reversal in a perpendicular-anisotropy CoFeB-MgO magnetic tunnel junction [9], which collectively enabled energy-efficient, voltage-controlled switching central to this era [7][8][9]. Shoji Ikeda [2] is a prominent figure in this era, with affiliations at MIT [5] and the University of Utah [6]. Ikeda's work on the 2008 paper [7], the 2010 paper [8], and the 2012 paper [9] helped establish high-TMR CoFeB-MgO devices, electric-field control of perpendicular magnetic anisotropy, and voltage-driven switching as cornerstones of low-power spin-orbitronics [7][8][9].