Magnetic Properties of Epitaxial Fe/(Ga,Mn)As Hybrids
نویسندگان
چکیده
Thinlm structures composed of two kinds of ferromagnetic material metallic Fe and semiconducting (Ga,Mn)As were investigated by means of SQUID magnetometry and ferromagnetic resonance spectroscopy. Dependence of remnant magnetic moment on temperature showed unexpected anisotropic features when recorded along two orthogonal in-plane directions. For one of these orientations, the change in sign of the slope of m(T ) curve at the Curie point of (Ga,Mn)As was observed, while for the other, an analogous m(T ) curve retained monotonic character. Based on the comparison with ferromagnetic resonance data, the apparent non-monotonicity was attributed to the temperature-induced change of balance between the external magnetic eld and uniaxial magnetic anisotropy in the plane of Fe layer.
منابع مشابه
Giant planar Hall effect in epitaxial (Ga,Mn)as devices.
Large Hall resistance jumps are observed in microdevices patterned from epitaxial (Ga,Mn)As layers when subjected to a swept, in-plane magnetic field. This giant planar Hall effect is 4 orders of magnitude greater than previously observed in metallic ferromagnets. This enables extremely sensitive measurements of the angle-dependent magnetic properties of (Ga,Mn)As. The magnetic anisotropy field...
متن کاملReconstruction control of magnetic properties during epitaxial growth of ferromagnetic Mn3-deltaGa on Wurtzite GaN(0001).
Binary ferromagnetic Mn(3-delta)Ga (1.2<3-delta< or =1.5) crystalline thin films have been epitaxially grown on wurtzite GaN(0001) surfaces using rf N-plasma molecular beam epitaxy. The film structure is face-centered tetragonal with CuAu type-I (L1(0)) ordering with (111) orientation. The in-plane epitaxial relationship to GaN is nearly ideal with [110](MnGa) parallel[1100](GaN) and [112](MnGa...
متن کاملExperimental Study on the Magnetomechanical Characteristics of Ni-Mn-Ga Ferromagnetic Shape Memory Alloy Single Crystals
Magnetic shape memory properties of Ni-Mn-Ga single crystals were characterized by measurement of stress-induced martensite reorientation under constant magnetic fields. Also magnetic field-induced strain as a function of the applied magnetic field under different constant compressive stress levels has been investigated. All the experiments were performed at room temperature in which the sample...
متن کاملIntroduction to Dilute Magnetic Semiconductors
This paper begins with a brief introduction to the field of spintronics and dilute magnetic semiconductor (DMS), the second part discusses in detail on three typical DMS materials–(Ga,Mn)As, (Ga,Mn)N and Transition metal doped oxide. Next mechanism of DMS ferromagnetism along with its magneto transport properties are discussed. Following that, an important sample preparation technique in DMS– M...
متن کاملThe effect of post annealing on structure, microstructure and magnetic properties of thin Ni-Mn-Ga films
The magnetic shape memory (MSM) alloy Ni-Mn-Ga is an active material where large strains are obtained by magnetically induced reorientation (MIR) of martensitic variants. For the integration in microsystems, epitaxial thin films are in the centre of interest since the highest strains have only been obtained in single crystals. In order to minimize the technological effort, sputter deposition at...
متن کامل