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scientists create the world\'s first 2d magnet

by:Newland     2019-09-04
Scientists discovered two types for the first time.
Two-dimensional magnets formed by single-layer atoms may pave the way for tighter and efficient devices.
Magnetic materials are the foundation of technologies that play an increasingly important role in our lives today, including sensing and hard
Disk data storage.
Scientists discovered two types for the first time.
Two-dimensional magnets formed by single-layer atoms may pave the way for tighter and efficient devices.
Magnetic materials are the foundation of technologies that play an increasingly important role in our lives today, including sensing and hard
Disk data storage.
For smaller and faster devices, researchers are looking for new magnetic materials that are more compact, more efficient and can be controlled using precise and reliable methods.
A team led by the University of Washington (UW)
And the Massachusetts Institute of Technology (MIT)
In the United States, the magnetic properties of a single layer were first discovered in the 2D world, or materials formed by a single atomic layer.
The results published in the journal Nature show that magnetic properties exist even in the 2D field --
Open up a world of potential applications.
\"What we found here is an isolated 2D material with inherent magnetic properties, and the magnetic properties in the system are very strong,\" said Xu Xiaodong, a UW professor.
\"We expect new information technologies to emerge based on these new 2D magnets,\" Xu said . \".
The researchers have previously indicated that CrI3-
Its multi-layer, 3D, bulk crystal form-
That is, it has some magnetism.
However, when refined to a single atomic sheet, no 3D magnetic material has previously retained its magnetic properties.
In fact, single-layer materials can show unique performance that cannot be seen in multi-layer 3D forms.
\"You simply cannot accurately predict the electrical, magnetic, physical or chemical properties of 2D single-layer crystals will be based on the behavior of their 3D volume copies,\" said Bevin Huang, a PhD student at the University of Wisconsin.
The atoms in a single layer of material are considered two-
Because electrons can only move in atomic films like chess pieces on chess boards.
To discover the features of CrI3 in 2D form, the team simply scraped a layer of CrI3 from a larger 3D crystal form using transparent tape.
\"It\'s very effective to use transparent tape to peel the single layer from a 3D large crystal,\" said UW\'s PhD student, Gina Clarke . \".
The researchers tested the magnetic properties of CrI3 using a special type of microscope.
In two layers of thick CrI3 flakes, the magnetism disappears and returns in three layerslayer CrI3.
Scientists will need further research to understand why CrI3 shows these significant layers-
Depends on the magnetic phase.
\"Only 2D single layers provide an exciting opportunity to study the intense and precise electrical control of magnetic properties, which is a challenge to achieve using 3D bulk crystals,\" Xu said . \".
\"But when you stack single layers with different physical properties together, there may be a greater chance.
\"There, you can see more exotic phenomena that can\'t be seen in single-layer or 3D bulk crystals,\" Xu added . \".
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