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The zero-moment half metal: How can it change spintronics?
Published on Jan 25, 20164239 Views
A zero-moment half metal is a ferromagnetic metal with a gap in the density of states at the Fermi level for either the spin-up or spin-down electrons. Such a material, if stoichiometric, should have
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Chapter list
The zero-moment half metal – how can it change spintronics?00:00
The zero-moment half metal03:28
MRG - A zero-moment half-metal03:43
Coey-Stamenov Group 2014 04:36
Outline05:15
Half-metals & Heuslers05:36
What is a half-metal?05:44
What is its spin moment?08:38
Why is spin polarization important for spintronics?10:52
Tunnel magnetoresistance (TMR) 13:07
An MgO tunnel barrier magnetic tunnel junction14:05
Thin film stack deposition - Shamrock Tool17:38
What is a Heusler?18:35
Heusler Alloys - 118:42
Heusler Alloys - 220:28
Half Heusler Alloys25:08
Tetragonal Mn-based ‘Heusler’ Alloys25:49
Mn3Ga 27:41
Tetragonal and Cubic Mn-Ga films28:25
Mn3-xGa thin film growth29:39
Mn3Ga films grown on platinum; Tetragonal D02230:20
Point-contact Andreev reflection31:25
Mn2Ga films grown on 001 MgO; Tetragonal D02233:22
Growth of cubic Mn3Ga and Mn2Ga films33:34
Mn2Ru0.5Ga MRG34:43
The Zero-moment Half Metal35:18
Electronic structure of cubic Mn2Ga films 35:56
Mn2RuxGa films; Cubic with biaxial strain 36:22
Atomic structure of cubic Mn2RuxGa37:11
Calculations37:37
Mn2Ga / Mn2RuxGa39:09
MRG magnetic properties can be tuned by Ru concentration x40:39
Magnetotransport properties of cubic Mn2RuxGa films40:48
Anomalous Hall Effect - 142:47
Anomalous Hall Effect - 244:37
MRG-based Tunnel Junctions45:50
TMR at 10 mV (right), at -1V (left), annealed at 350°C, various temperatures48:00
X-ray magnetic circular dichroism XMCD48:39
What we expect to see – sum of Mn 4a and 4c 49:34
X-ray Magnetic Circular Dichroism; Experiment50:17
XMCD; site-specific Mn moments50:44
TR-MOKE measurement51:10
What could it be good for?51:17
New spintronic memory52:01
A terahertz on-chip oscillator52:45
Summary57:42
CRANN, Trinity College Dublin58:13
Thank you!58:18