What are the magnetic heterolayers good for

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 sensors M-RAM Spin-transistor semiconductor Quantuminformation Impact of GMR based field sensors on magnetic data storage Areal density [Mb/in2] Evolution of magnetic data storage on hard disc drives 10 5 10 4 10 3

10 2 10 1 10 0 10 -1 10 -2 10 -3 Superparamagnetic effect GMR Magnetoresistive heads inductive read head 1960 1970

1980 Year 1990 2000 2010 rotating sensor layer FM1 fixed layer FM2 How to pin FM2 while the sensor layer FM1 rotates? Exchange Bias! Pinning of the ferromagnet by an antiferromagnet from T>TN to T

10 HEB : -40 JS AFSFM 0MFM t FM 5 H -20 20 AF 40 0H [mT] -5 -10 Hfc TN T

Meiklejohn Bean: coherent magnetization reversal of a pinned FM MFM KFM, H Hysteresis shifted by HEB : JS AFSFM 0MFM t FM FM interface magnetization: SFM coupling constant: J AF interface magnetization: SAF MFM :saturation magnetization of FM layer tFM HE vs. mFM of Fe0.6Zn0.4F2(110)/Fe14 nm/Ag35nm 1.0 H AF Hfc -6 2 m FM [10 A m ]

0.5 0.0 T TN=47K -0.5 -1.0 -60 -40 -20 0 0 H [mT] 20 40 60

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