14677
By applying the cation exchange to FeO / CoFe ( 2 ) O ( 4 ) core / shell nanocrystals the Ne e l temperature of the core material is increased and exchange - bias effects are enhanced so that vertical shifts of the hysteresis loops are obtained which are superior to those in any other system .
 Chemical: FeO; Chemical: CoFe ( 2 ) 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: FeO; Chemical: CoFe ( 2 ) O ( 4 )