What are the magnetic heterolayers good for Basic components of modern spintronic devices Conventional electronics has ignored the spin of the electron.

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Presentation transcript:

What are the magnetic heterolayers good for Basic components of modern spintronic devices Conventional electronics has ignored the spin of the electron Advantages using spin degree of freedom: magnetic field sensorsM-RAM ? Spin-transistor semiconductor Quantum- information

Superparamagnetic effect inductive read head Magnetoresistive heads GMR Evolution of magnetic data storage on hard disc drives Impact of GMR based field sensors on magnetic data storage

rotating sensor layer FM 1 fixed layer FM 2

 How to pin FM 2 while the sensor layer FM 1 rotates? Exchange Bias! Pinning of the ferromagnet by an antiferromagnet field cooling: from T>T N to T<T N

coupling constant: J AF interface magnetization: S AF FM interface magnetization: S FM M FM :saturation magnetization of FM layer t FM K FM, H M FM Meiklejohn Bean: coherent magnetization reversal of a pinned FM Hysteresis shifted by

 H E vs. m FM of Fe 0.6 Zn 0.4 F 2 (110)/Fe14 nm/Ag35nm