Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Microwave magnetic field modulation of spin torque oscillator based on
  perpendicular magnetic tunnel junctions   Modulation of a spin-torque oscillator (STO) signal based on a magnetic
tunnel junction (MTJ) with perpendicularly magnetized free layer is
investigated. Magnetic field inductive loop was created during MTJ fabrication
process, which enables microwave field application during STO operation. The
frequency modulation by the microwave magnetic field of up to 3 GHz is
explored, showing a potential for application in high-data-rate communication
technologies. Moreover, an inductive loop is used for self-synchronization of
the STO signal, which after field-locking exhibits significant improvement of
the linewidth and oscillation power.

15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg