ShiLei Zhang, JingYan Zhang, Alexander A. Baker, ShouGuo Wang, GuangHua Yu, Thorsten Hesjedal
Scientific Reports 4, 6109 (2014) |
| (a) Generic concept for magnetic 3D memory. Typically several magnetic units are stacked on top of each other, where each unit stores one bit of information. In a conventional scheme, the magnetisation state of a unit depends on the sequence of bits in the stack, i.e., |1000〉, …, |0001〉 going from left to right in the example shown. However, if the layers are treated as indistinguishable, the state of the stack is adequately described by only counting the number of spin-up layers. In this way, all four states shown in (a) have the same logic value of ‘1’. (b–f) illustrate the five logic states a four-layer stack can store: |0〉, |1〉, |2〉, |3〉, and |4〉, respectively. This counting scheme is analogous to the beads in an abacus, as shown for comparison. |
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