Example for magnetic material used in data storage devices is:

45 Permalloy

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C r O_{2}

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Cunife

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Alnico

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Solution

The correct option is B $C r O_{2}$
Magnetic storage is the storage of data on a magnetised medium. Magnetic storage uses different patterns of magnetisation in a magnetisable material to store data and is a form of non-volatile memory. The information is accessed using one or more read/write heads. The commonly used magnetic particles are Iron oxide particles or Chromium oxide and metal particles with size of 0.5 micrometers.

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