In-plane uniaxial magnetic anisotropy in epitaxial Fe3O4-based hybrid structures on GaAs(100)

Magnetic anisotropies in epitaxial Fe3O4/GaAs(100) patterned structures

“…As we have already shown elsewhere, 18 our Fe 3 O 4 thin film is very unique in that it exhibits a strong in-plane uniaxial magnetic anisotropy (two-fold), superimposed with a negligible intrinsic cubic anisotropy (four-fold). [18][19][20] Moreover, such a magnetic anisotropy system does not exist in epitaxial Fe 3 O 4 thin films prepared by other techniques.…”

“…Although an in-depth analysis of such a decrease in the K U is out of the scope of this work, we would like to point out that the relaxation of the uniaxial anisotropy in this case might be closely related to the chemical bonding at the Fe 3 O 4 /GaAs(100) interface, which has been discussed by some of us elsewhere. 18 Equally important is the negligible K 1 values observed in both of our film and patterned wires, which are significantly lower than those in bulk Fe 3 O 4 and in other reported Fe 3 O 4 thin films. 17,40 Another aspect one may notice in the second column of Fig.…”

“…[18][19][20] Moreover, such a magnetic anisotropy system does not exist in epitaxial Fe 3 O 4 thin films prepared by other techniques. [21][22][23] On the other hand, from the charge transport measurements in our high-quality epitaxial Fe 3 O 4 film, a resistivity of about 5 × 10 −3 Ω cm has been demonstrated, which is very close to that of bulk single crystal [24][25][26] and much lower than those of the commonly reported Fe 3 O 4 thin.…”

“…The hysteresis loops were acquired by a home-built focused magneto-optical Kerr effect (f-MOKE) magnetometer, with a 1 µm laser spot on the samples, and the magnetic fields were applied along the two major crystallographic axes, [0][1][2][3][4][5][6][7][8][9][10][11] Table I. 18 Therein K U and K 1 of the continuous film were obtained from our previous work on numerical fitting of the angular dependences of the ferromagnetic resonance field of the film. is expected to reorient the easy axis into the [011] direction due to the large demagnetizing field along the [0-11] direction, they still follow the easy-and hard magnetization axes of the thin film, as shown in Fig.…”

Hybridization-induced charge rebalancing at the weakly interactive C60/Fe3O4(001) spinterface

“…Both first-and half-order diffraction spots on a cubic plane are clearly observed, thus indicating the expected inverse spinel structure of Fe 3 O 4 . On the other hand, being a mixed-valence material with a well-defined Fe 3þ / Fe 2þ ion distribution, the stoichiometry and oxidation state of Fe 3 O 4 can be further confirmed by XMCD [22][23][24][25]. Fig.…”