Transact SQL :: Move Files From One Location To Another Using Powershell

I have a job which copies .txt files 24 hours 7 days a week to c:TempSource

What I am planning to do is copy the files from one location to another say c:TempTarget

So I have written the Powell shell script and when i put that in the sql agent job i get below error ;

A job step received an error at line 5 in a PowerShell script. The corresponding line is '$filesToMove = $files | Where -Property "Name" -NotLike -Value $newestFile.Name'. Correct the script and reschedule the job. The error information returned by PowerShell is: 'A parameter cannot be found that matches parameter name 'Property'. '. Process Exit Code -1. The step failed.

$sourceFiles = "c:TempSource*.txt"
$targetFolder = "c:TempTarget"
$files = Get-ChildItem $sourceFiles
$newestFile = ($files | sort LastWriteTime -Descending)[0]
$filesToMove = $files | Where -Property "Name" -NotLike -Value $newestFile.Name
$filesToMove | ForEach { Move-Item $_ $targetFolder }