L2PC Introduction to Spintronics: Spin-Orbit Physics at Interfaces [ENG]

#spintronics #CrystalField #quenching #MagnetocrystallineAnisotropy #Rashba #RashbaEffect #DzyaloshinskiiMoriyaInteractions #Dzyaloshinskii #Moriya
Lecture Series: Introduction to Spintronics by Prof. Aurelien Manchon
physiquemancho...
Lecture 2 Part C: Spin-orbit physics at interfaces
00:51 Crystal field and orbital quenching
06:03 Magnetocrystalline Anisotropy
15:25 Rashba and Dzyaloshinskii-Moriya Interactions
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Lecture Series
Introduction
Part A: Helicopter View of Spintronics ( • L0PA Introduction to S... )
Part B: Basics of Magnetostatics ( • L0PB Introduction to S... )
Part C: The Discovery of the Spin ( • L0PC Introduction to S... )
Lecture 1
Part A: Spin and Orbital Momenta ( • L1PA Introduction to S... )
Part B: Fundamental Interactions ( • L1PB Introduction to S... )
Part C: The Magnetic Zoo ( • L1PC Introduction to S... )
Lecture 2
Part A: Band Magnetism in Transition Metals ( • L2PA Introduction to S... )
Part B: Magnetism at Surfaces and Interfaces ( • L2PB Introduction to S... )
Part C: Spin-orbit Physics at Interfaces ( • L2PC Introduction to S... )
Lecture 3
Part A: Para- and Diamagnetism ( • L3PA Introduction to S... )
Part B: Ferro- and Antiferromagnetism ( • L3PB Introduction to S... )
Part C: Magnetic Phase Transitions ( • L3PC Introduction to S... )
Lecture 4
Part A: Micromagnetics ( • L4PA Introduction to S... )
Part B: Magnetization Dynamics ( • L4PB Introduction to S... )
Lecture 5
Part A: Magnetic Domain Walls ( • L5PA Introduction to S... )
Part B: Domain Wall Dynamics ( • L5PB Introduction to S... )
Lecture 6
Part A: Electronic Transport in Metals ( • L6PA Introduction to S... )
Part B: Spin Transport in Metals ( • L6PB Introduction to S... )
Part C: Spin-Dependent Tunneling ( • L6PC Introduction to S... )
Lecture 7
Part A: Spin Transfer and Spin Pumping ( • L7PA Introduction to S... )
Part B: Current-driven magnetization dynamics ( • L7PB Introduction to S... )
Part C: Spin dynamics in magnetic textures ( • L7PC Introduction to S... )
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[@ddphuyal]

I must say, your lectures are splendid. Very nice work Prof. Dr. Manchon!

[@yizheng181]

the magnetic anisotropy energy for one-full-spin assumption should add the cofficient of one quarter in 9:32

[@visheshsaxena6199]

19:54 there should be a correction. the orbital momentum in the y direction comes indirectly from the mixing of the px and pz orbitals in the bottom chain mediated via the pz orbitals in the top chain. Isn't it? You mentioned that it came from the mixing of the px and py orbitals of the bottom chain. While earlier in the lecture you mentioned indirect mixing of the px and pz of the bottom chain.

[@Baigle1]

Wonder if this can be used to make neodymium permanent magnets much stronger by enhancing the locked micrograins with oxide and other surface orbital inflections. Perhaps it could be a special treatment on a very select set of grain surface sizes and properties. Then again, optimizing the whole of the grain->crystal structure would make for a higher strength magnet as well.. Maybe we could get a couple Tesla this time around without pinching larger bulky magnetic domains into a pyramidal ring. Im sure the binder is weaker than it could be too

[@Baigle1]

And the implications for strong boundary fields at microscopic levels is enticing... 😛
We might be able to have that functional boundary plasma after all

[@homkarsuvidyakumar6210]

A very nice and easy to follow presentation. Thanks a lot. Just a small question, you mentioned there will be in-plane magnetic anisotropy for a surface since the out of plane orbital moment is quenched. But then how in Co/Pt there is perpendicular magnetic anisotropy for thin Co layer. This is a little confusing and I will be grateful if you could answer it.

[@iqbalashraf4711]

Exactly, this is also my main confusion. Orbitals in a crystal environment becomes totally non degenerate. As a result their Eigen state become real . Therefore their angular momentum projection on Z axis become zero. Since orbitals such as dz2 and dx2-dy2 which is perpendicular to the plane does not interact with the crystal environment, therefor they are still degenerate, orbital moment due to them on Z axis should not be quenched. However they must also have orbital moment projection on the plane of crystal which must be bigger than Uz moment.