Barnett effect

WORKING TOWARDS THE DETECTION OF THE NUCLEAR BARNETT EFFECTBRYANT E. AVILA

CARLOS MERILES’ LAB

2015

BACKGROUND

ANGULAR MOMENTUM AND SPIN

MASS MASSR

MASSP= *VELOCITY

L=RxP

J: Spin

The same year Einstein and de Haas showed the counter effect.

Homonuclear Dipole – Dipole Hamiltonian: Expresses the interaction of two likespins with fixed physical coordinates.

HOW DOES PHYSICAL ROTATION INDUCE MAGNETIZATION?

Expressed in spherical coordinates.

Ehrenfest Theorem

It can be shown that…

WhereBut we are talking about a macroscopic system…

THE EQUIVALENCE

IT PRODUCES THE SAME RESULT!

Rotation Effect Magnetization Effect

CHANGING TO A ROTATING FRAME

It is clear that magnetization would be produce Due to the appearance of a so called ghost magnetic field

QUESTION?Can the Barnett Effect be expressed and detected at the nuclear regime?

WHY?As a first it has never been proven. If proved it can open the door to pumping spin magnetization through mechanical rotation instead of using NMR magnetic fields which are very expensive to maintain. Possibly special rotation + vibrations sequences can be created to obtain desired results.

GUESS…I do believe this effect should be pronounced, but we need an experiment to test the theory as always.

PROBLEM!!!There is no machinery out in the market that would allow us to conduct this experiment right away.

Built a machine capable of functioning in many stages in order to prove this effect.

WHAT SHOULD THIS MACHINE BE CAPABLE OF?

SpinningBullet containing

sample.

ShuttlingBullet.

NMRSignal

MAIN STAGES

SpinningBullet containing

sample.

COMPONENTS OF SPINNING STAGE.

CONTROLLERS & SHUTTLING STAGE.

Spinning & Shutting Coils(Magnetic fields)

COMPONENTS OF ANALYSIS STAGE

SOFTWARE AND TRANSLATION.

SOFTWARE AND TRANSLATION.

FUTURE WORK

ACKNOWLEDGEMENTS

Dr. Carlos Meriles

And everybody in his lab!!

Linden Langhorne (Machine Shop)

NIH grant 5T34GM007639-34

Henry Wong

Dr. Nair, Tiburzi.

THANK YOU! ANY QUESTIONS?