摘要 |
A toggle MTJ is disclosed that has a SAF free layer with two or more magnetic sub-layers having equal magnetic moments but different anisotropies which is achieved by selecting Ni<SUB>~0.8</SUB>Fe<SUB>~0.2 </SUB>for one sub-layer and CoFeB or the like with a uni-axial anisotropy of 10 to 30 Oe for the higher anisotropy sub-layer. When a field is applied at <10° angle from the easy axis, magnetic vectors for the two sub-layers rotate to form different angles from the easy axis. A method is also described for selectively writing to bits along a word line that is orthogonal to bit line segments and avoids the need to "read first". A bipolar word line pulse with two opposite pulses separated by a no pulse interval is applied in the absence of a bit line pulse to write a "0". A bit line pulse opposite the second word line pulse writes a "1".
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