What are dilute magnetic semiconductors?
Dilute magnetic semiconductors (DMS) are semiconductors doped with transition metal atoms. The primary aim of a DMS is compatibility with existing semiconductor structures and materials. The level of doping directly affects the magnetic properties of the DMS and affects the Curie temperature.
On what principle does spintronic memory devices work?
Spintronics is one of the emerging fields for the next-generation nanoelectronic devices to reduce their power consumption and to increase their memory and processing capabilities. Such devices utilise the spin degree of freedom of electrons and/or holes, which can also interact with their orbital moments.
Are semiconductors paramagnetic?
Technically talking, the dilute magnetic semiconductors (DMS) are a class of semiconductor materials, which allow for a high spin polarization. The DMS materials, like (Zn,Mn)Se or other Mn doped semiconductors, are paramagnetic (nonmagnetic) when no external magnetic field is applied.
What is magnetic dilution?
The magnetic dilution method was employed in order to elucidate the origin of the slow relaxation of the magnetization in a Dy(2) single-molecule magnet (SMM). The quantum tunneling of the magnetization that can occur was suppressed by applying optimum dc fields.
What are magnetic semiconductors give some examples?
Cobalt-doped titanium dioxide (both rutile and anatase), ferromagnetic above 400 K. Chromium-doped rutile, ferromagnetic above 400 K. Iron-doped rutile and iron-doped anatase, ferromagnetic at room temperature. Copper-doped anatase.
What do you understand by spintronics?
Spintronics (a neologism for “spin transport electronics”), also known as magnetoelectronics, is an emerging technology that exploits the intrinsic spin of the electron and its associated magnetic moment, in addition to its fundamental electronic charge.
What are spintronics devices?
Electronic and spintronic devices are devices that use the properties of electrons to transmit, process and store information. Spintronic devices instead use another fundamental property known as spin, which is the intrinsic angular momentum of the electron.
What are magnetic semiconductors mention some magnetic semiconductor materials?
In history, the list of candidate magnetic semiconductors can be grouped into two categories: undoped magnetic semiconductors, such as europium chalcogenides and semiconducting spinels that have a periodic array of magnetic elements on their own; [16,17] and doped magnetic semiconductors, such as (Cd,Mn)Se [18] and (Ga …
What is the application of the magnetic semiconductor?
Magnetic semiconductors are semiconductor materials that exhibit both ferromagnetism (or a similar response) and useful semiconductor properties. If implemented in devices, these materials could provide a new type of control of conduction.
Why do we need spintronics?
Spintronics has several advantages over conventional electronics. Less energy is needed to change spin than to generate a current to maintain electron charges in a device, so spintronics devices use less power. Spin states can be set quickly, which makes transferring data quicker.
What is meant by spintronics and mentions its applications?
Spintronics (a portmanteau meaning spin transport electronics), also known as spin electronics, is the study of the intrinsic spin of the electron and its associated magnetic moment, in addition to its fundamental electronic charge, in solid-state devices.
What kind of semiconductor is a diluted magnetic semiconductor?
Semimagnetic semiconductors, also known as diluted magnetic semiconductors (DMS), form a class of semiconducting materials, where atoms (ions) with high magnetic moments have been introduced into a semiconductor host crystal.
Is the lattice constant of a semiconductor a function of composition?
The crystallographic structure of the semiconductor is conserved; the lattice constant is a function of composition. From a magnetic point of view SMSs are disordered magnetic materials, since magnetic atoms are randomly distributed in the cation sublattice of the semiconductor compound.
When was the study of semimagnetic semiconductors started?
Studies of semimagnetic semiconductors were initiated in the late 1970s, starting from introduction of Mn ions in II–VI semiconductors, such as CdTe or HgTe.
How are magnetic moments and delocalized charge carriers related?
Generally speaking, in SMSs there coexist two interrelated and interacting subsystems: mobile delocalized charge carriers and localized magnetic moments connected with paramagnetic ions. Electronic (mainly optical) properties of SMSs have been the subject of intensive studies since early in 1970.