Researcher

Group Web Site

https://www.kiroku.riec.tohoku.ac.jp/

Research Activities

Our main interest lies in high-density information storage technology. The amount of data generated in the form of multimedia, IoT and AI information increases dramatically every year. Information storage systems with high performance, high capacity and low power consumption are needed to store this data. In this group, we are conducting research into high density information storage based on magnetic recording and magnetic devices. Magnetic materials and devices are modelled using micromagnetic simulations. Our aim is fast, low-cost, high-capacity storage (over 10 Tbits/inch2 areal density), in which the size of each stored bit of information occupies an area of less than 100 nm2. We are also investigating magnetic devices for neuromorphic and stochastic computing applications.

Recording Theory Computation(Assoc. Prof. Greaves)

Research topics

• Micromagnetic simulations of information storage devices
• High areal density hard disk drives
• Magnetic information storage devices
• Magnetic devices for neuromorphic computing

Micromagnetic simulations are used to model the behaviour of magnetic materials used in information storage applications. To model a recording medium the individual magnetic grains of the medium can be simulated. Then, using a head field distribution from a finite element model, recording simulations can be carried out. The design of the head and medium can be optimised through the model.
We also model other magnetic devices, such as magnetic random-access memories (MRAM), spin-torque oscillators, magnetic devices for neuromorphic computing, etc. Some other micromagnetic simulation examples are shown. Magnetic nanowires, two-dimensional spin ices, domain wall pinning and energy-assisted recording are some of the topics we have worked on.

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