9190
The exchange - coupled CoFe 2 O 4 - - Fe 3 O 4 binary nanocrystal superlattices show single - phase magnetization switching behavior and magnetoresistance switching behavior below 200 K .
 Chemical: CoFe 2 O 4; Chemical: Fe 3 O 4
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: CoFe 2 O 4; Chemical: Fe 3 O 4