Wider stable temperature range memory cores

Improvement of temperature characteristic of polycrystalline high-speed switching memory cores having a basic chemical composition 0.9(Li
0.5
Fe
2.5
O
4
) adding 0.1(MgO
0.17
, MnO
0.39
,ZnO
0.13
,Fe
2
O
.3,0.31
,) is studied. Ferrite memory cores that provide outstandingly stable operation over a temperature range from -55 to +100°C with low temperature coefficients of uV1 and Ib were successfully developed by means of composite constitution containing 0.1 to 2 mol% CoFe
2
O
4
and 0.05 to 0.5 mol% LaFe
12
O
19
.