Journal
JOURNAL OF APPLIED PHYSICS
Volume 131, Issue 1, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0072128
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Funding
- CREST Program of JST [JPMJCR1777]
- PRESTO Program of JST [JPMJPR19LB]
- Spintronics Research Network of Japan
- [17H04922]
- [18H05345]
- [19K21961]
- [20H05650]
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In this study, the spin-dependent transport properties of fully ferromagnetic p-n junctions were systematically investigated, and the variation of magnetoresistance with the GaSb thickness was found. When the n-type (In,Fe)As layer was used in the structure, a giant magnetoresistance of over 500% was observed.
We systematically investigate the spin-dependent transport properties of fully ferromagnetic (Ga,Fe)Sb/GaSb/(In,Fe)Sb and (Ga,Fe)Sb/(In,Fe)As p-n junctions grown by low-temperature molecular beam epitaxy. The (Ga,Fe)Sb/GaSb/(In,Fe)Sb p-n junctions show high Curie temperature (170-310 K) and rectifying characteristics. The polarity and magnitude of magnetoresistance of the (Ga,Fe)Sb/GaSb/(In,Fe)Sb junctions strongly depend on the GaSb spacer thickness (t). Large positive magnetoresistance (MR, 58%) and negative MR (-1.6%) were observed at 3.7 K for the samples with t = 2 and 4 nm, respectively. When the n-type (In,Fe)Sb layer was replaced by the n-type (In,Fe)As, giant MR over 500% was observed, which can be explained by spin-valve and spin-splitting effects. Our results shed light on rich spin-transport physics observed in fully ferromagnetic p-n junctions.
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