H2020Индивидуална стипендия2016–2018

Standard EF · The research of spin orbit torques in perpendicular magnetic anisotropy systems.

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2016-10-01 → 2018-09-30
Финансиране от ЕС: 159 461 €
Участници: 1
Схема: MSCA-IF-EF-ST

Линиите свързват координатора с партньорите.

Накратко на български

Спин-орбиталните моменти и взаимодействията между магнитните спинове се изучават чрез структури като скирмионите. Разбирането на тези механизми помага за създаването на по-стабилна памет с по-нисък разход на енергия.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

The research of spin orbit torques in perpendicular magnetic anisotropy systems.

Fast, high density and low power microelectronic devices are crucial enablers of today’s IT technology. With semiconductor devices facing severe limitations for their performance in the future, spintronics technologies have been recently identified as the most likely technology for the next generation of non-volatile random access memory. This is due to the fact that magnetic technologies are inherently non-volatile and thus retain their information without power. However, current spintronic approaches based on magnetic bits made of “single domain” spin structures or “domain walls” result in limited stability and an unacceptably high level of power consumption during operation due to the high currents and current densities required for manipulating the spins by spin transfer torque. Recently a radically new scientific and technological approach is necessary to tackle these key drawbacks, and obtain small and stable spin structures as well as new mechanisms to efficiently manipulate these. A key element in obtaining small and stable spin structures is known as the Dzyaloshinskii-Moriya interaction (DMI). The DMI which arises in the presence of spin orbit coupling and inversion asymmetry leads to a non-collinear interaction resulting in a spin texture such as chiral domain walls and skyrmions. Along with the DMI in the presence of spin orbit coupling a mechanism to exploit these spin structures arises which is called the spin orbit torque (SOT). These effects are intriguing for its possible high efficient manipulation and stabilization of spin structures for application memory applications. However, in order to manipulate and maximize these effects first we must understand the underlying mechanisms. The project has focused on understanding the underlying physics of DMI and SOT by studying these effects in various systems. By fully understanding the effects and being able to manipulate the effects in a manner to fully maximize the efficiency. This would lead to possible technologies for designing an ultra-efficient memory devices.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

The current semiconductor devices are facing physical limitations and need a new technology to replace them. Spintronics technologies have been recently identified as the most likely technology for the next generation of non-volatile random access memory. However, current spintronic approaches based on magnetic bits made of “single domain” spin structures or “domain walls” result in limited stability and an unacceptably high level of power consumption during operation due to the high currents and current densities required for manipulating the spins by spin transfer torque. To overcome these drawbacks, a new approach to achieve a more stable spin structure and a more efficient way to manipulate them is needed. This new approach is achieved in a system of a heavy metal (nominally with strong spin orbit interactions) and magnetic layer where the inversion symmetry is broken. In systems with inversion asymmetry and with strong spin orbit coupling, an additional symmetry breaking term can occur, the Dzyaloshinskii-Moriya interaction (DMI). The DMI provides a favoring chirality of the spin structures thus gives a more stable spin stucture. However, the origin and the exact extraction of the DMI is not yet established. The new approach in the efficient manipulations of spins also require a system with spin orbit interactions. Thus, when a current is applied through the heavy metal due to the spin orbit interaction an effective spin orbit torques acts on the spin of the magnetic layer. The origin of the torques are known to be the spin Hall effect and the Rashba effect. However, the exact origins of the torques ares still in debate. In this research we will be studying the origin of the DMI and spin orbit torques. Based on the knowledge through the research the correlation between the DMI and the spin orbit torques will be revealed. Furthermore, we will to tune the DMI and spin orbit torques in order to achieve high efficient switching for memory device applications.

Оригинален текст от CORDIS (на английски).

Участници

JOHANNES GUTENBERG-UNIVERSITAT MAINZ · MainzКоординаторГермания