Antiparallel state, compensation point, and magnetic phase diagram of Fe3O4/Mn3O4 superlattices

G. Chern, Lance Horng, W. K. Shieh, T. C. Wu

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

The magnetic response of a ferrimagnetic/ferrimagnetic superlattice, [Fe3O4(20 Å/Mn3O4(80 Å)]x20, is measured as a function of external field (-50-50 kOe) and temperature (5-300 K). A compensation point (Tcp) is identified ∼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 >˜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* ∼10kOe, the magnetization is enhanced and then saturates at H∼ 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 Fe3O4 phases. M-H curves also show asymmetry at temperatures below and above Tcp, which is probably related to the anisotropy effect of Mn3O4(tetragonal structure). The fundamental mechanism of the antiparallel coupling between Mn3O4 and Fe3O4is also discussed.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume63
Issue number9
DOIs
Publication statusPublished - 2001 Feb 12

Fingerprint

Superlattices
Phase diagrams
superlattices
phase diagrams
curves
Remanence
remanence
Temperature
temperature
Magnetization
Multilayers
Anisotropy
Phase transitions
energy transfer
asymmetry
moments
magnetization
anisotropy
Compensation and Redress
manganese oxide

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Antiparallel state, compensation point, and magnetic phase diagram of Fe3O4/Mn3O4 superlattices",
abstract = "The magnetic response of a ferrimagnetic/ferrimagnetic superlattice, [Fe3O4(20 {\AA}/Mn3O4(80 {\AA})]x20, is measured as a function of external field (-50-50 kOe) and temperature (5-300 K). A compensation point (Tcp) is identified ∼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 >˜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* ∼10kOe, the magnetization is enhanced and then saturates at H∼ 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 Fe3O4 phases. M-H curves also show asymmetry at temperatures below and above Tcp, which is probably related to the anisotropy effect of Mn3O4(tetragonal structure). The fundamental mechanism of the antiparallel coupling between Mn3O4 and Fe3O4is also discussed.",
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Antiparallel state, compensation point, and magnetic phase diagram of Fe3O4/Mn3O4 superlattices. / Chern, G.; Horng, Lance; Shieh, W. K.; Wu, T. C.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 63, No. 9, 12.02.2001.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Antiparallel state, compensation point, and magnetic phase diagram of Fe3O4/Mn3O4 superlattices

AU - Chern, G.

AU - Horng, Lance

AU - Shieh, W. K.

AU - Wu, T. C.

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N2 - The magnetic response of a ferrimagnetic/ferrimagnetic superlattice, [Fe3O4(20 Å/Mn3O4(80 Å)]x20, is measured as a function of external field (-50-50 kOe) and temperature (5-300 K). A compensation point (Tcp) is identified ∼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 >˜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* ∼10kOe, the magnetization is enhanced and then saturates at H∼ 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 Fe3O4 phases. M-H curves also show asymmetry at temperatures below and above Tcp, which is probably related to the anisotropy effect of Mn3O4(tetragonal structure). The fundamental mechanism of the antiparallel coupling between Mn3O4 and Fe3O4is also discussed.

AB - The magnetic response of a ferrimagnetic/ferrimagnetic superlattice, [Fe3O4(20 Å/Mn3O4(80 Å)]x20, is measured as a function of external field (-50-50 kOe) and temperature (5-300 K). A compensation point (Tcp) is identified ∼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 >˜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* ∼10kOe, the magnetization is enhanced and then saturates at H∼ 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 Fe3O4 phases. M-H curves also show asymmetry at temperatures below and above Tcp, which is probably related to the anisotropy effect of Mn3O4(tetragonal structure). The fundamental mechanism of the antiparallel coupling between Mn3O4 and Fe3O4is also discussed.

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