Question

321312 What scientific 3213 information 321can be obtained by spin-polarized scanning tunneling microscopy that cannot be obtained via the spin unpolarized equivalent. Please support your answer by reference(s)

Answer 1

Some Important points about Sp-STM

1.Whereas normal STM is sensitive to the “normal” non-magnetic local density of states of the sample surface, SP-STM is sensitive to the magnetic local density of states of the sample surface

2. SP-STM is sensitive to the spin density of the surface in the vicinity of the Fermi level, within the energy window defined by the applied bias voltage

3. Since the total magnetization of any point on a surface is related to the occupied spin density integrated over all energy, SP-STM is not sensitive to the total magnetic moment of the sample surface Rather, it is only sensitive to the partial magnetic moment near the Fermi level

4. SP-STM is not sensitive to the magnetic field (it is not a fieldsensitive technique)

5. If either the tip or sample magnetic local density of states is equal to zero, Then there will be no spin contrast

6. Or, if tip and sample magnetization vectors are perpendicular, spin contrast will be zero.

References:

https://www.researchgate.net/profile/Matthias_Bode2/publication/228583321_Spin-polarized_scanning_tunnelling_microscopy/links/02e7e53b52e3ad17ab000000/Spin-polarized-scanning-tunnelling-microscopy.pdf

https://journals.aps.org/rmp/abstract/10.1103/RevModPhys.86.1127

https://pdfs.semanticscholar.org/fe16/c485fa379e08286ca21d8634a4c1bfa910c7.pdf

http://www-old.mpi-halle.mpg.de/mpi/publi/pdf/6902_06.pdf]

please follow the above references to get good idea about ur question. thank u