In the magnetic tunnel-junctions (MTJs) tunnelling is easier when
Explanation:
Options 3 and 4 are incorrect because aluminium oxide acts merely as a barrier or insulator. It is not polarised. Only magnetic material can be polarised. The passage mentions, “It turns out that such tunnelling is easier when the two magnetic layers are polarised in the same direction than when they are polarised in opposite directions”. This makes option 2 incorrect. Hence, the correct answer is option 1.
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