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Titolo:
Antiparallel state, compensation point, and magnetic phase diagram of Fe3O4/Mn3O4 superlattices - art. no. 094421
Autore:
Chern, G; Horng, L; Shieh, WK; Wu, TC;
Indirizzi:
Natl Chung Cheng Univ, Dept Phys, Chiayi, Taiwan Natl Chung Cheng Univ Chiayi Taiwan eng Univ, Dept Phys, Chiayi, Taiwan Changhua Univ Educ, Dept Phys, Changhua, Taiwan Changhua Univ Educ Changhua Taiwan iv Educ, Dept Phys, Changhua, Taiwan
Titolo Testata:
PHYSICAL REVIEW B
fascicolo: 9, volume: 6309, anno: 2001,
pagine: 4421 -
SICI:
0163-1829(20010301)6309:9<4421:ASCPAM>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOLECULAR-BEAM EPITAXY; FILMS; TRANSITIONS; MGO(001); FE3O4; LAYER; MBE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Chern, G Natl Chung Cheng Univ, Dept Phys, Chiayi, Taiwan Natl Chung ChengUniv Chiayi Taiwan Dept Phys, Chiayi, Taiwan
Citazione:
G. Chern et al., "Antiparallel state, compensation point, and magnetic phase diagram of Fe3O4/Mn3O4 superlattices - art. no. 094421", PHYS REV B, 6309(9), 2001, pp. 4421

Abstract

The magnetic response of a ferrimagnetic/ferrimagnetic superlattice, [Fe3O4 (20 Angstrom)/Mn3O4 (80 Angstrom)](x20), is measured as a function of external field (-50-50 kOe) and temperature (5-300 K). A compensation point (T-cp) is identified similar to 33 K at which the remanence changes sign and low-field M-T curves show minima, indicating that the net moments of Fe3O4 and Mn3O4 are antiparallel. At temperatures >similar to 50 K, the magnetic response becomes pure Fe3O4-like. Detailed M-H curves (at T<50 K) further exhibit magnetic phase transition at higher external field. As H is above H*<similar to>10 kOe, the magnetization is enhanced and then saturates at H similar to 40 kOe. These phases are similar to the twisted phases, originating from a competition between Zeeman and exchange energies, previously observed in antiparallel metallic multilayers. A H-T magnetic phase diagram of the present superlattice is presented and five phases are included: the Mn3O4-aligned, Fe3O4-aligned, twisted, ferrimagnetic saturated, and pure Fe3O4phases; M-H curves also show asymmetry at temperatures below and above T-cp, which is probably related to the anisotropy effect of Mn3O4 (tetragonal structure). The fundamental mechanism of the antiparallel coupling between Mn3O4 and Fe3O4 is also discussed.

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Documento generato il 29/05/20 alle ore 16:52:58