ferroelectric AND ferromagnetic - 2023 ARCADIA

Question

Two answers required. Nicola Spaldin’s group pioneered the study of materials that exhibit these two properties, which are of interest for developing ultra-low power logic devices. For 10 points each:

[10h] Give these two properties, which rarely occur together because one is favored by empty d-shells and the other is favored by partially filled d-shells. Bismuth ferrite is an example of a material with both of these two properties, which share a common prefix.

ANSWER: ferroelectric AND ferromagnetic [reject partial answers; prompt on multiferroic]

[10e] Intel’s recent MESO architecture reads out a multiferroic layer using the inverse Rashba-Edelstein effect, in which accumulation of this quantity generates current. This quantity is an intrinsic form of angular momentum.

ANSWER: spin [or spin angular momentum]

[10m] While ferromagnetic materials display nonzero magnetization, ferroelectric materials display nonzero values of this quantity in the absence of external fields. The divergence of this vector field, symbolized P, is the bound charge.

ANSWER: polarization density [or electric polarization]

<VD, Physics>

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Summary


2023 ARCADIA at Duke	Emory, Duke, Yale	Y	4	7.50	50%	0%	25%
2023 ARCADIA at Emory	Emory, Duke, Yale	Y	3	10.00	67%	33%	0%
2023 ARCADIA at Imperial	Imperial	Y	5	16.00	100%	40%	20%
2023 ARCADIA at Maryland	Maryland, Online	Y	2	10.00	100%	0%	0%
2023 ARCADIA at Ohio State	Ohio State, Texas	Y	3	6.67	67%	0%	0%
2023 ARCADIA Online	Maryland, Online	Y	3	13.33	67%	67%	0%
2023 ARCADIA at Texas	Ohio State, Texas	Y	3	10.00	67%	0%	33%
2023 ARCADIA at UC Berkeley	Premiere	N	2	20.00	100%	50%	50%
2023 ARCADIA at Carleton University	Premiere	N	3	13.33	100%	33%	0%
2023 ARCADIA at Claremont Colleges	Premiere	N	1	10.00	100%	0%	0%
2023 ARCADIA at Duke	Emory, Duke, Yale	N	4	10.00	100%	0%	0%
2023 ARCADIA at Emory	Emory, Duke, Yale	N	4	17.50	100%	50%	25%
2023 ARCADIA at Imperial	Imperial	N	5	14.00	100%	20%	20%
2023 ARCADIA at Indiana	Premiere	N	5	14.00	100%	20%	20%
2023 ARCADIA at Maryland	Maryland, Online	N	3	13.33	100%	33%	0%
2023 ARCADIA at Ohio State	Ohio State, Texas	N	3	10.00	100%	0%	0%
2023 ARCADIA Online	Maryland, Online	N	3	16.67	100%	33%	33%
2023 ARCADIA at RIT	Premiere	N	2	10.00	100%	0%	0%
2023 ARCADIA at Texas	Ohio State, Texas	N	3	20.00	100%	67%	33%
2023 ARCADIA at WUSTL	Premiere	N	3	16.67	100%	67%	0%

Data


South Carolina B	Duke	0	0	0	0
South Carolina A	NC State	0	10	0	10
Emory A	Georgia Tech C	0	10	0	10
Georgia A	Georgia Tech A	0	0	0	0
Georgia Tech D	Georgia Tech B	0	10	10	20
Cambridge B	Imperial A	0	10	10	20
Oxford	Bristol	0	10	0	10
George Washington A	George Washington B	0	10	0	10
Maryland A	Johns Hopkins	0	10	0	10
Michigan B	Kenyon B	0	10	0	10
Michigan A	Ohio State A	0	10	0	10
Ohio State B	Kenyon A	0	0	0	0
Boston College	Arizona State	0	0	0	0
Farrellmagnetism	Zen and the Art of Buzzing	0	10	10	20
Ganon Evans Fan Club	MSU A and Friend	0	10	10	20
HCC	TAG Magnet: Taylor's Version	0	0	0	0
Texas A	TAMU	10	10	0	20
Texas C	Texas B	0	10	0	10
James Madison A	North Carolina A	0	0	0	0
North Carolina B	James Madison B	10	10	0	20
Edinburgh	Birmingham	0	10	0	10
Cambridge A	Warwick	0	10	0	10
Durham	Imperial B	10	10	10	30