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The Hall Effect

The Hall Effect

Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.

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A Polymer-based Piezoelectric Vibration Energy Harvester with a 3D Meshed-Core Structure

A Polymer-based Piezoelectric Vibration Energy Harvester with a 3D Meshed-Core Structure

Published on: February 20, 2019

Piezo Voltage Controlled Planar Hall Effect Devices.

Bao Zhang¹, Kang-Kang Meng², Mei-Yin Yang¹

¹SKLSM, Institute of Semiconductors, CAS, P. O. Box 912, Beijing 100083, People's Republic of China.

Scientific Reports

|June 23, 2016

Summary

This summary is machine-generated.

Researchers demonstrate electrical control of magnetization switching in hybrid piezoelectric/ferromagnetic devices. This allows for room-temperature magnetic logic gates without external magnetic fields, paving the way for spintronic applications.

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Area of Science:

Spintronics
Materials Science
Condensed Matter Physics

Background:

Electrical control of magnetization switching is crucial for advanced spintronic devices.
Existing methods often require external magnetic fields or high energy consumption.

Purpose of the Study:

To investigate the electrical control of magnetization switching in hybrid piezoelectric/ferromagnetic devices.
To demonstrate room-temperature magnetic logic gates using this novel approach.

Main Methods:

Fabrication of hybrid piezoelectric (PZT)/ferromagnetic (Co2FeAl) devices.
Application of piezo voltages to tune the planar Hall voltage in the ferromagnetic layer.
Observation of magnetization switching through 90° induced by piezo voltages.

Main Results:

Planar Hall voltage in Co2FeAl was successfully tuned solely by piezo voltages.
Magnetization switching of 90° was achieved in the plane under applied piezo voltages.
Room-temperature magnetic NOT and NOR logic gates were demonstrated without external magnetic fields.

Conclusions:

Piezo voltage-controlled planar Hall effect in hybrid devices offers a new pathway for spintronic applications.
This method enables magnetic information storage and processing using ferromagnetic materials at room temperature.
The developed devices show potential for low-power, field-free spintronic logic operations.