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. 2020 Apr 18;12:93. doi: 10.1007/s40820-020-00424-2

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© The Author(s) 2020

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Fig. 6 — Development trend of spin device structure (graphene as an example). A Non-local spin valve with oxide tunnel barriers, B with suspended graphene, C with a different substrate, D with hBN as encapsulation or tunnel barrier