Magnetic and transport properties of monocrystallineFe
3
O
4

• Authors: Karen Paul
• Languages of publication: EN

Abstracts

EN

A monocrystal ofFe
3
O
4 is characterized by resistance, magnetoresistance and magnetic measurements in a temperature range from 4.2 K to 350 K and magnetic field-cycling from −9 T to 9 T. The resistance measurements revealed a metal-insulator Verwey transition (VT) atT
v=123.76 K with activation energy E=92.5 meV at T >T
v and temperature-substitute for the activation energy below the VT,T
0=E/k
B≈3800 K within 70 K–110K. The magnetotransport results independently verified the VT at 123.70 K, with discontinuous change in the magnetic moment ΔM≈0.21 ΔM≈0.21μ
B and resistance hysteresis, dependent on the magnetic field in a narrow temperature range of 0.4° around theT
v. The magnetic characterization established self consistentlyT
v as ≈123.67 K, the jump in the magnetization at the VT≈0.25μ
B and confirmed, that the magnetocrystalline anisotropy is the main microscopic mechanism responsible for the magnetization of the monocrystal (88%) with additional natural and imposed defects contributing as 12%.

Keywords

EN

Magnetite; Verwey transition; transport properties; magnetoresistance; magnetic properties; 75.30.Et; 75.70.Ak; 75.70.Pa

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2005
• Volume: 3
• Issue: 1
• Pages: 115-126

Dates

published

1 - 3 - 2005

online

1 - 3 - 2005

Contributors

author

Karen Paul

• University of Missouri-Rolla, 65401, Rolla, MO, USA

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Identifiers

DOI

10.2478/BF02476510